Best Marketing Automation Platform for Agencies Managing Multiple Client Accounts (2026)

The research in brief

ActiveCampaign is the consensus leader for agency multi-client marketing automation in this 7-platform AI study, named by 5 of 7 platforms (71.4%) with an average listed position of 3.6 and a best position of 2. Vendasta ties on mentions (5 of 7, 71.4%) and is the strongest alternative for agencies that want a white-label client portal, a resellable services marketplace, and wholesale-to-retail margin control. VBOUT is the best fit for agencies that want a branded platform with master-account/sub-account switching and reusable campaign assets. Campaign Monitor has the best average listed position of any qualifier (2.5) but was named by only 2 platforms. The study covered 7 platforms and 27 unique entities; 9 qualified by being named by at least two platforms. The principal limitation: one standardized prompt was sent once to each platform, AI answers vary by date, wording, model, and retrieved sources, and company-owned citations materially outnumber independent ones.

Research Snapshot

• Topic: Best marketing automation platform for agencies managing multiple client accounts (agency multi-client marketing automation).
• Target buyer: A marketing agency or freelance consultant managing several separate client accounts who needs one system to run all of them efficiently, with clean client separation, white-label reporting, reseller-friendly pricing, and billing pass-through options.
• Geography: United States.
• Platforms included (7): ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, Gemini.
• Research date: 2026-10-01 (authoritative run date). Platform-reported dates are provenance metadata and do not independently prove freshness; several platforms reported earlier dates, disclosed in Methodology Limitations.
• Unique entities named: 27.
• Qualifying entities: 9.
• Eligibility rule: named by at least two platforms during ranking discovery.
• Ranking rule: platform mentions, then average listed rank, then best listed rank.

The Consensus Ranking

Questions explored

• What are the best marketing automation platforms for an agency managing multiple client accounts in 2026?
• Which agency marketing automation platform is named by the most AI platforms for multi-client work?
• Which platforms qualify for an agency multi-client shortlist based on cross-platform consensus?

Platform mentions count only platforms that named the entity during ranking discovery. All included platforms evaluated fit, but mention counts are not the same as fit-assessment counts. The full category context for these platforms sits in the marketing automation and email marketing software directory.

Which provider fits your situation?

Questions explored

• Which agency marketing automation platform should a buyer choose if white-label client reporting is the top requirement?
• Is ActiveCampaign or Vendasta better for an agency that wants reseller discounts and direct client billing?
• Which platform should a technical agency choose if it wants to self-host and own client infrastructure?

1. ActiveCampaign

Questions explored

• Is ActiveCampaign worth it for an agency managing multiple client accounts, and what are its main drawbacks?
• Which agency marketing automation platform has the lowest published reseller discount tiers for client accounts?

ActiveCampaign is the consensus leader for this use case, named by 5 of 7 platforms with an average listed position of 3.6 and a best position of 2. Its Agency Partner Program is the most consistently documented reseller structure in the evidence set: a Partner Portal for creating, upgrading, administering, and monitoring resold client accounts, published volume discounts, and flexible billing models ^[136].

Why it ranked here. Five platforms named it, and four of those five rated the fit "good" while two rated it "mixed" ^[21]. The ranking is driven by breadth of documented agency mechanics rather than by any single capability: reseller discounts, partner portal administration, rebranding, API account management, and billing choice all appear in company documentation ^[131].

Best suited for. Agencies managing multiple independent client accounts through a centralized partner portal, agencies that want reseller economics and the ability to bill clients directly, and small to mid-market client programs using email marketing, CRM, and workflow automation ^[136].

Main strengths for the use case. Published reseller discounts scale by active account volume: 25% off at 2–24 accounts, 35% at 25–49, 45% at 50–99, and 55% at 100 or more, with the first active account at full price ^[22]. The Agency Program lets the agency bill clients directly or have ActiveCampaign manage account billing, and commission accounts are billed to the end client instead ^[18]. Rebranding and custom-domain options exist for resold accounts, and the Partner Portal supports bulk account management through Active Intelligence ^[21].

Main limitations. Partner Portal users are documented as having admin-level access to the shared portal, and public documentation does not establish granular per-client or least-privilege permissions for agency staff ^[24]. The agency is billed for each resold account, including paid and disabled accounts, until cancellation or account changes are completed ^[21]. Portfolio reporting excludes referred and affiliate accounts and most widgets may lag activity by roughly two to three days ^[27]. White-labeling is better characterized as branded or rebranded resale because technical infrastructure details may remain discoverable ^[21]. Multiple platforms also note there is no one-dashboard switch between client workspaces and no snapshot-style templating ^[211].

Pricing or cost summary. Public FAQ pricing starts at $15 for accounts with fewer than 1,000 contacts, but the exact Standard annual price for agency-resold accounts was not independently confirmed ^[129]. Resold accounts are billed monthly or annually on their own cadence, taxes may apply, and WhatsApp message credits are excluded from the standard reseller discount ^[21]. Third-party recurring billing tools such as Chargify, Recurly, WHMCS, or Subscription Manager are referenced for agencies that want automated client billing ^[23].

Where platforms disagreed. Fit ratings split between "good" (ChatGPT, DeepSeek, Gemini, Grok, Perplexity) and "mixed" (Claude, Kimi) ^[21]. White-label scope is the sharpest conflict: company materials describe rebranding and custom domains, one source states there is no white-label UI per program docs, and another states per-account white-labeling is available for Enterprise ^[211]. Discount tiers are published in the agreement but described as subject to revision ^[131].

Complete fit review: ActiveCampaign.

2. Vendasta

Questions explored

• Is Vendasta worth it for an agency that needs a white-label client portal and resellable services?
• Which agency platform has the lowest published monthly minimum for white-label client management?

Vendasta ties ActiveCampaign on platform mentions (5 of 7, 71.4%) but ranks second on average listed position (4.2). It is the strongest alternative for a distinct buyer need: agencies that want a white-label operating layer with client portals, a resellable services marketplace, and wholesale-to-retail margin control rather than deep native marketing automation ^[82].

Why it ranked here. Five platforms named it, and fit ratings ranged from "strong" (Grok) to "mixed" (Kimi), with the majority rating it "good" ^[217]. Its ranking reflects breadth of agency operations coverage - accounts, products, users, orders, fulfillment, reporting, branding, and billing from one Partner Center ^[86].

Best suited for. Agencies selling recurring digital marketing products and services to many small-business clients, agencies wanting white-label client portals, stores, reporting, and reseller operations, and agencies wanting client-level accounts, permissions, wholesale-to-retail pricing, and integrated billing ^[82].

Main strengths for the use case. Each client is represented as a separate account containing the client's business profile, active products, users, and service configuration ^[82]. The Professional plan includes a white-label client portal, and Vendasta documents white-label branding and custom-domain configuration for eligible paid subscriptions ^[204]. The Marketplace offers 250+ curated products with wholesale and retail prices, letting the agency set retail pricing and retain the margin ^[84]. Vendasta Payments through Stripe supports retail subscriptions, invoices, automatic renewal workflows, and payment collection ^[203].

Main limitations. Professional and Premium are publicly listed as billed monthly but subject to a one-year contract, and early exit carries full remaining-balance penalties with no reduced buyout ^[217]. Multiple independent reviews report billing confusion and double-billing incidents, and some users describe the interface as outdated with a steep learning curve ^[280]. Third-party Marketplace purchases may not count toward the monthly minimum, requiring careful tracking of qualifying spend ^[236]. Native marketing-automation depth is not sufficiently established by the reviewed sources for agencies seeking advanced CRM or multi-channel journey automation ^[82].

Pricing or cost summary. The reviewed official pricing page lists Professional at a $499 per month minimum of wholesale products and services under a one-year contract, and Premium at $999 per month under a one-year contract, with the platform subscription fee offset dollar-for-dollar by qualifying product spend ^[205]. Extra team seats are listed at $35 per seat per month on Professional, additional Snapshot Reports at $2 each, and payment processing at 2.9% + $0.30 per transaction ^[205]. Some third-party sources cite $649 per month, which likely reflects different billing terms or price changes ^[221].

Where platforms disagreed. Pricing framing conflicts across official pages: one pricing page describes a $0 subscription with a $99 monthly minimum on the Starter tier, while marketing pages describe Professional at $499 per month as the entry point for full white-label access ^[205]. Contract terms also conflict, with one page stating monthly billing with no contract and other sources describing one-year commitments for higher tiers ^[205]. Fit ratings ranged from strong to mixed across platforms ^[217].

Complete fit review: Vendasta.

3. VBOUT

Questions explored

• Is VBOUT worth it for an agency that wants a branded platform with client sub-accounts?
• Which agency marketing automation platform lets an agency copy campaigns and automations across client accounts?

VBOUT ranks third, named by 3 of 7 platforms (42.9%) with an average listed position of 4.67 and a best position of 4. It is the best-ranked option for agencies whose priority is a branded platform with master-account and sub-account switching plus reusable campaign assets ^[60].

Why it ranked here. Three platforms named it, and fit ratings split between "strong" (Gemini, Grok) and "good" (ChatGPT, Claude, Perplexity), with DeepSeek and Kimi rating it "uncertain" ^[253]. The ranking reflects a purpose-built agency portal with documented asset replication and billing controls ^[99].

Best suited for. Agencies wanting a branded marketing-automation platform for resale, agencies managing separate client sub-accounts from one master portal, and agencies standardizing campaigns, automations, landing pages, templates, and tasks across clients ^[60].

Main strengths for the use case. The Agency Portal lets an agency create and manage separate client accounts, choose each client's plan, switch into client accounts, and manage client add-ons ^[60]. Assets can be copied from the agency account to one or multiple sub-accounts, including email templates, automations, automated messages, landing pages, and tasks ^[99]. White-labeling covers logo, colors, and domain access, and the Partner Portal supports client-specific billing profiles, agency-card or client payment methods, client invoices, discounted-rate billing, agency markup, and commission structures ^[100]. The official pricing page lists an Agency configuration at $499 per month including 10 sub-accounts, with White Label and Custom Plan Builder each listed at $95 per month ^[187].

Main limitations. Agency-partner pricing, custom plans, volume discounts, and higher-volume rates require discussion with a success manager, and the cited agency materials do not establish a current exact price for the recommended agency configuration ^[103]. White-label report branding is less clearly documented than white-label platform branding ^[60]. Multiple independent reviews report the interface feels dated, and A/B testing within automations is not supported ^[241]. Email deliverability architecture at the Agency tier lacks explicit per-client domain isolation documentation, with dedicated IP pools referenced at the Enterprise level ^[224].

Pricing or cost summary. Public standard pricing shows $100 per month for a plan based on 5,000 monthly emails and $300 per month for 10,000 monthly emails, with a free tier limited to 500 emails per month and a 14-day trial ^[103]. The official pricing page lists the Agency configuration at $499 per month with 10 sub-accounts, plus $95 per month each for White Label and Custom Plan Builder ^[187]. Monthly subscriptions are stated as cancellable at any time, while annual billing involves a one-year payment commitment ^[103].

Where platforms disagreed. Fit ratings ranged from strong to uncertain across the seven platforms ^[253]. The exact agency plan name is not consistent across sources, with references to white-label, agency partner, and agency-focused plans ^[187]. Included sub-account counts and pricing also conflict across third-party summaries ^[187].

Complete fit review: VBOUT.

4. Brevo

Questions explored

• Is Brevo worth it for an agency that needs isolated client accounts with centralized administration?
• Which agency marketing automation platform requires an Enterprise plan for sub-account management?

Brevo ranks fourth, named by 3 of 7 platforms (42.9%) with an average listed position of 5.0 and a best position of 4. It is the best-ranked option for agencies that prioritize operational separation and centralized administration over white-label resale ^[48].

Why it ranked here. Three platforms named it, and fit ratings split between "good" (ChatGPT, Claude, Grok) and "mixed" (DeepSeek, Perplexity), with Kimi rating it "weak" ^[33]. Its ranking reflects a genuine multi-account architecture gated behind an Enterprise contract ^[269].

Best suited for. Agencies managing several client accounts that need operational separation and centralized access, agencies willing to negotiate an Enterprise plan and use Brevo's sub-account architecture, and agencies that want clients to retain separate Brevo accounts while granting the agency controlled access ^[48].

Main strengths for the use case. Brevo Enterprise supports an Admin account with separate sub-accounts, each with its own dashboard, contact lists, API key, campaigns, automation, transactional messaging, and reporting ^[48]. Sub-organizations are described as completely independent of each other ^[33]. Enterprise administrators can define users and permissions at the sub-account level, and sub-account groups can restrict administrators to selected client accounts ^[47]. The Admin account can allocate monthly email, user, inbox, and landing-page credits across sub-accounts, and Brevo documents a single invoice for all sub-accounts with an option to invoice separately ^[47].

Main limitations. Multi-account features are exclusive to the Enterprise plan; lower tiers do not include them ^[269]. White-label reporting is not verified in the reviewed public documentation, and one independent review states Brevo is not a white-label solution out of the box ^[266]. Enterprise pricing is custom and requires negotiation, with one source citing approximately $10,000 per year and another citing $1,000 per month ^[214]. Brevo lacks native SCIM provisioning, so user management at scale requires manual dashboard workflows ^[298]. The Agency Partner Program offers revenue share of 10%–25% rather than documented wholesale reseller pricing, and commissions apply only to clients that have not previously purchased a paid plan ^[142].

Pricing or cost summary. Public self-serve plans start at $9 per month for Starter and $18 per month for Business, with additional user seats on some plans ^[38]. The Enterprise multi-account configuration is custom-quoted, and dedicated IPs are listed at $251 per year outside the included Enterprise allocation ^[39]. Removing Brevo branding is listed at $9 per month on lower tiers ^[214].

Where platforms disagreed. Fit ratings ranged from good to weak across platforms ^[33]. Two parallel multi-account models are documented - classic sub-accounts and newer sub-organizations - with migration path and feature parity unclear ^[33]. Enterprise pricing is stated as both "from $10,000/year" and "from $1,000/month" in different sources ^[214].

Complete fit review: Brevo.

5. Campaign Monitor

Questions explored

• Is Campaign Monitor worth it for an email-focused agency that needs white-label client reporting and markup billing?
• Which agency marketing automation platform has the best average listed position despite fewer platform mentions?

Campaign Monitor ranks fifth on mentions (2 of 7, 28.6%) but has the best average listed position of any qualifier at 2.5, with a best position of 2. It is the strongest option for email-focused agencies that want white-label branding, isolated client billing, and markup-enabled resale ^[148].

Why it ranked here. Only two platforms named it, which caps its rank under the mentions-first rule, but both placed it high - Perplexity at 2 and Claude at 3 ^[155]. Fit ratings were "strong" for Gemini and Grok, "good" for ChatGPT, Claude, DeepSeek, and Perplexity, and "weak" for Kimi ^[106].

Best suited for. Email-focused agencies managing multiple independent client brands, agencies that want separate client sub-accounts under one administrative structure, and agencies reselling email marketing with custom markups and client-specific billing ^[148].

Main strengths for the use case. Campaign Monitor advertises multiple sub-accounts under a main administrative account, with separate client lists, campaigns, templates, analytics, and sending settings ^[156]. Private-label options can remove Campaign Monitor branding and apply the agency's logo, colors, and domain to the client-facing experience ^[154]. Agency features include markup options, in-app billing management, client-specific rates, local-currency billing, and contract or pay-as-you-go options ^[156]. Template and automation sharing across sub-accounts reduces repeated setup work ^[156].

Main limitations. Agency pricing is not fully published; the public pricing page notes that annual discounts do not apply to agency or multi-team plans ^[215]. Automation is limited to simple if/then branching with roughly five conditional branches per workflow and lacks nested conditions ^[286]. Contact-based pricing scales steeply: Essentials reaches $199–$429 per month at 25,000 contacts depending on the source ^[249]. The platform is primarily email-centered, and selected AI features may not be available to agency accounts ^[156].

Pricing or cost summary. Standard plans start at approximately $13 per month for Lite, $31 per month for Essentials, and $171 per month for Premier at 500 contacts, with a 10% annual discount that does not apply to agency or multi-team plans ^[289]. An agency pay-per-campaign option is documented at $6 plus 1.5 cents per recipient ^[249]. No free plan is offered; a 30-day trial and a five-subscriber sandbox are available ^[245].

Where platforms disagreed. Fit ratings ranged from strong to weak across platforms ^[106]. Kimi states Campaign Monitor does not offer true sub-accounts and that each client requires a separate paid account, while ChatGPT, Claude, Gemini, Grok, and Perplexity describe sub-account structures ^[148]. Pricing figures also vary across sources, with Lite cited at both $11 and $13 per month ^[251].

Complete fit review: Campaign Monitor.

6. Interspire Email Marketer

Questions explored

• Is Interspire Email Marketer worth it for a technical agency that wants to self-host multiple client accounts?
• Which agency marketing automation platform has the lowest one-time license cost for multi-client email marketing?

Interspire Email Marketer ranks sixth, named by 2 of 7 platforms (28.6%) with an average listed position of 3.0 and a best position of 2. It is the best-ranked option for technically capable agencies that want a self-hosted, white-labeled, email-focused multi-client platform with predictable one-time licensing ^[172].

Why it ranked here. Two platforms named it, and fit ratings split sharply: "strong" for Grok, "good" for ChatGPT and Claude, "mixed" for Gemini and Perplexity, and "weak" for DeepSeek and Kimi ^[169]. The ranking reflects documented multi-tenancy and white-labeling at a low one-time cost, offset by self-hosting burden.

Best suited for. Technical agencies comfortable operating their own server, database, SMTP infrastructure, backups, security, and deliverability processes; agencies managing multiple email-marketing clients from one installation with client-specific users, lists, templates, campaigns, and reports; and white-label email-marketing services where the agency owns the client-facing brand and infrastructure ^[169].

Main strengths for the use case. The platform supports multiple independent client accounts within one installation, each with separate users, lists, autoresponders, templates, and contacts ^[169]. User and group permissions can restrict access to features, contact lists, segments, templates, campaigns, autoresponders, and forms ^[163]. White-label customization is included in the listed licenses, and the agency page states Interspire branding can be removed and replaced with agency branding ^[169]. Per-user SMTP settings and sending limits give agencies control over client-specific delivery infrastructure ^[169].

Main limitations. Self-hosting shifts infrastructure, security, backup, uptime, compliance, and deliverability responsibility to the agency, and the product requires Linux with Apache or Nginx, PHP 8.4, MySQL 8.0 or MariaDB 10.5+, and cron access ^[172]. The licensing page states that a license cannot be resold, transferred, or exchanged, which constrains software-reseller models ^[172]. Only five user accounts are included in the standard listed plans, and additional accounts require a quote ^[172]. No native client billing, invoicing, usage metering, or automated billing pass-through was identified ^[169]. Deepseek and Kimi both report that current product availability and pricing could not be confirmed, and Kimi states the official site does not clearly list Email Marketer as an available product ^[162].

Pricing or cost summary. The official pricing page lists Self-Install at $495 one time and Pro-Installation at $695 one time, both including five user accounts, unlimited contacts, unlimited emails, white-labeling, one year of updates, and one year of email support ^[172]. Optional maintenance and support renewal starts at 25% of the license price ^[172]. Hosting, SMTP, backups, security, monitoring, and administration are additional ongoing costs borne by the agency ^[172].

Where platforms disagreed. Fit ratings ranged from strong to weak across platforms ^[169]. Deepseek and Kimi could not confirm sub-account, white-label, or permission-separation features, while ChatGPT, Claude, Gemini, Grok, and Perplexity describe them as documented capabilities ^[162]. Some third-party directories display the license amounts as monthly prices, which the official pricing page contradicts ^[172].

Complete fit review: Interspire Email Marketer.

7. systeme.io

Questions explored

• Is systeme.io worth it for an agency that wants isolated client workspaces and white-label resale at low cost?
• Which agency marketing automation platform lets an agency keep 100% of white-label subscription revenue?

systeme.io ranks seventh, named by 2 of 7 platforms (28.6%) with an average listed position of 3.5 and a best position of 2. It is the best-ranked low-cost option for agencies that want isolated client workspaces and optional white-label resale from a single subscription ^[57].

Why it ranked here. Two platforms named it, and fit ratings ranged from "strong" (Grok) to "good" (ChatGPT, Gemini, Perplexity) to "mixed" (Claude, DeepSeek) and "weak" (Kimi) ^[96]. The ranking reflects a genuinely low all-in price with sub-accounts and white-label resale, offset by limited permission granularity and no independent client logins.

Best suited for. Agencies managing multiple small-business or creator clients from one operating account, consultants that want to provide each client an isolated workspace, and agencies seeking an all-in-one replacement for separate funnel, email, CRM, course, booking, and basic commerce tools ^[57].

Main strengths for the use case. systeme.io supports unlimited sub-accounts, with each sub-account functioning as a separate systeme.io account and inheriting the applicable resource limits of the main plan ^[57]. Each client can have distinct statistics, payment gateways, domains, and workspace members ^[58]. The White Label feature supports a custom domain, agency name, logo, favicon, brand colors, sender identity, branded login and dashboard pages, and custom reseller plans ^[59]. systeme.io states that agencies keep 100% of white-label subscription revenue with no revenue share or transaction fee on white-label plan sales ^[98].

Main limitations. White-label reseller prices cannot be lower than systeme.io's official price in the selected currency, which limits aggressive discounting ^[59]. Once White Label is activated, the feature cannot currently be deleted, reset, or deactivated, and the selected domain becomes dedicated to White Label routing ^[59]. The documented roles are Assistant and Administrator, and public documentation does not establish a comprehensive granular permission matrix ^[57]. Anthropic and Kimi both report that sub-account access is mediated through the agency's main account rather than independent client logins ^[96]. Public documentation does not demonstrate advanced client-facing white-label reporting or consolidated multi-client analytics ^[57].

Pricing or cost summary. The official pricing page lists Unlimited at $97 per month, with annual billing available and the exact current annual amount not displayed consistently across official pages ^[95]. White Label is advertised as included with systeme.io plans at no separate fee, subject to plan availability and a custom domain ^[59]. Subscription plans are stated as non-refundable, and the terms permit automatic plan upgrades if usage exceeds plan limits ^[97].

Where platforms disagreed. Fit ratings ranged from strong to weak across platforms ^[96]. The ranking-stage label "Agency/Enterprise Plan" does not appear to be the consistent current public plan name; official pages primarily refer to the Unlimited plan ^[95]. One official page says White Label is included with every plan while third-party material claims it is limited to Unlimited ^[59].

Complete fit review: systeme.io.

8. IGSendMail

Questions explored

• Is IGSendMail worth it for an agency reselling email marketing under its own brand?
• Which agency marketing automation platform has conflicting plan entitlements that buyers must verify before purchase?

IGSendMail ranks eighth, named by 2 of 7 platforms (28.6%) with an average listed position of 4.0 and a best position of 3. It is the best-ranked option for email-focused agencies that want white-label resale at a relatively low fixed cost, but the evidence base is the weakest in this study ^[72].

Why it ranked here. Two platforms named it, and fit ratings ranged from "strong" (Gemini, Grok) to "good" (Claude, Perplexity) to "mixed" (ChatGPT) and "uncertain" (DeepSeek, Kimi) ^[67]. The ranking reflects a purpose-built agency reseller offer, tempered by internal inconsistencies in the public documentation.

Best suited for. Email-focused agencies reselling campaign automation under their own brand, small or mid-sized agencies needing separate client workspaces and centralized administration, and agencies that value fixed send-volume pricing, unlimited contacts on paid plans, white-labeling, and the ability to set client pricing ^[72].

Main strengths for the use case. IGSendMail states that agencies can create isolated client sub-accounts with separate lists, automations, analytics, and role-based access, managed from one dashboard ^[72]. The agency offering claims custom logo, colors, domain, white-labeled login and dashboard, branded system emails, custom tracking domains, and branded PDF reports ^[75]. The Agency reseller page lists $199 per month, or $159 per month when billed annually, with unlimited client accounts and built-in subscription billing, and claims agencies can set client prices and collect payments through Stripe or PayPal ^[75]. Paid plans include unlimited automations, API access, and webhooks ^[73].

Main limitations. The public documentation is internally inconsistent about whether the $99 Business plan provides the same agency sub-account and billing capabilities as the $199 Agency reseller plan ^[72]. The agency page references unlimited sub-accounts while the Business description references 25 sub-account users, and the distinction between accounts, users, and clients is unclear ^[72]. Dedicated IP availability is described as included in some reseller-plan claims but as Agency Pro-only or a $25 per month Business add-on elsewhere ^[73]. IGSendMail states that it is not SOC 2 audited and is not a HIPAA-covered service ^[69]. No deduplicated independent citation was supplied for this entity; the evidence base is company-owned or platform-reported ^[67].

Pricing or cost summary. The Agency reseller plan is listed at $199 per month or $159 per month billed annually, and Agency Pro at $449 per month or $359 per month annually, with Enterprise custom-priced ^[75]. The Business plan is listed at $99 per month with 500,000 emails per month and unlimited contacts, and Business overage is listed at $0.75 per 1,000 additional emails ^[73]. Reseller plans are stated as month-to-month with no long-term contracts and can be canceled at any time ^[75].

Where platforms disagreed. Fit ratings ranged from strong to uncertain across platforms ^[67]. Kimi reports that the domain returned no retrievable product information during research and that the entity does not appear in marketing automation directories, while Gemini, Grok, Claude, Perplexity, and ChatGPT describe detailed agency features ^[67]. Plan names and included features vary across official pages ^[73].

Complete fit review: IGSendMail.

9. Acelle Send

Questions explored

• Is Acelle Send worth it for an agency that wants a self-hosted multi-tenant email platform it fully controls?
• Which agency marketing automation platform has the lowest one-time license cost for multi-tenant resale?

Acelle Send ranks ninth, named by 2 of 7 platforms (28.6%) with an average listed position of 5.0 and a best position of 3. It is the best-ranked option for agencies that want a self-hosted, white-label, multi-tenant email-marketing system they control and can operate across separate client accounts ^[8].

Why it ranked here. Two platforms named it, and fit ratings ranged from "strong" (Claude) to "good" (ChatGPT, Gemini, Grok, Perplexity) to "mixed" (DeepSeek) and "uncertain" (Kimi) ^[4]. The ranking reflects a documented multi-tenant architecture at a low one-time cost, offset by self-hosting burden and limited independent validation.

Best suited for. Agencies reselling email marketing under their own domain and brand, agencies managing multiple client tenants from one self-hosted installation, and cost-sensitive agencies willing to manage servers, SMTP providers, domains, security, backups, and deliverability ^[8].

Main strengths for the use case. The Extended License is described as supporting multi-tenant customer accounts, client-specific plans, quotas, and isolated lists and campaigns ^[8]. Agency administrators can manage clients centrally while customers receive their own logins and can create campaigns, lists, automations, A/B tests, and reports ^[8]. White-labeling covers custom domains, branded login and administration surfaces, logo and color customization, and client-facing branded interfaces ^[4]. Each customer can reportedly be assigned its own sending-server record, including separate Amazon SES identities, SendGrid sub-accounts, or Postal routes ^[8]. The Extended License includes Stripe, PayPal, Braintree, and Paddle billing modules and the right to charge end users ^[3].

Main limitations. The product is self-hosted, so the buyer is responsible for server infrastructure and operational administration, while sending is handled through a separately selected SMTP or email-delivery provider ^[8]. Both licenses include lifetime updates and six months of technical support, with post-support availability and pricing not clearly specified ^[8]. Public documentation does not fully establish fine-grained employee permissions, audit trails, or full client-level role administration ^[8]. The platform appears email-centric rather than a complete multi-channel agency operating system ^[8]. Deepseek and Kimi both report that the existence and contents of a distinct "Agency Reseller Edition" plan are unclear, and that billing pass-through, white-label reporting scope, and per-client permission details are not independently documented ^[2].

Pricing or cost summary. The Extended License is listed at USD 199 as a one-time software payment, with the Regular License at USD 80 for single-domain use ^[8]. Self-hosted server or VPS costs, SMTP or email-delivery-provider charges, and agency labor for installation, upgrades, monitoring, backups, security, and deliverability are additional ^[8]. Applicable taxes may be added at checkout, and extended ticket support after the included six-month period may cost extra ^[8].

Where platforms disagreed. Fit ratings ranged from strong to uncertain across platforms ^[4]. Public pricing is inconsistent across sources, with $80, $69, and a $199 per month agency entry appearing in different pages ^[7]. The official site uses both Acelle Send and AcelleMail branding, and the relationship between the brand names should be confirmed before contracting ^[8].

Complete fit review: Acelle Send.

What this study reveals

Questions explored

• What do AI platforms consistently recommend for agencies managing multiple client accounts?
• Which agency marketing automation capabilities are most often documented across the ranked platforms?

Three patterns emerge from the nine qualifying entities. First, the market splits into two distinct architectures. ActiveCampaign, Brevo, and Interspire Email Marketer use separate accounts or sub-accounts under a partner or admin structure ^[136]. Vendasta, VBOUT, Campaign Monitor, systeme.io, IGSendMail, and Acelle Send use a client-portal or tenant model where the agency operates a branded layer above client workspaces ^[204].

Second, white-label depth is the most contested capability. Vendasta, VBOUT, Campaign Monitor, systeme.io, IGSendMail, and Acelle Send all document white-label branding, but the scope varies from full client portals to per-account CSS customization ^[204]. ActiveCampaign documents rebranding while disclosing that technical infrastructure details may remain discoverable ^[21]. Brevo does not verify white-label reporting in public documentation ^[266].

Third, billing pass-through is the least consistently delivered capability. ActiveCampaign, Vendasta, VBOUT, Campaign Monitor, systeme.io, IGSendMail, and Acelle Send all document some form of client billing or reseller billing ^[18]. Brevo documents consolidated or separate invoicing but not a full reseller markup workflow ^[48]. Interspire documents no native billing pass-through at all ^[169].

Where the AI Platforms Agreed

Questions explored

• Which agency marketing automation platforms do most AI platforms agree are good fits for multi-client work?
• What capabilities do AI platforms consistently attribute to the top-ranked agency platforms?

Platforms agreed on several points. ActiveCampaign and Vendasta were the only entities named by five platforms, and both were described as good or strong fits by the majority of platforms that assessed them ^[136]. Multiple platforms independently described ActiveCampaign's volume discount tiers as 25%–55% based on active account volume ^[22]. Multiple platforms independently described Vendasta's Professional plan as the entry point for full white-label access ^[217]. Multiple platforms independently described VBOUT's asset replication across sub-accounts ^[99]. Multiple platforms independently described Campaign Monitor's private labeling and markup billing ^[156].

Where the AI Platforms Disagreed

Questions explored

• Where do AI platforms disagree about agency marketing automation platforms, and what should buyers verify?
• Which ranked platform has the widest gap between platform fit ratings?

Disagreements cluster in four areas. Fit ratings diverged most for Interspire Email Marketer, rated strong by Grok and weak by DeepSeek and Kimi ^[169]. Sub-account architecture is disputed for Campaign Monitor, where Kimi states no true sub-accounts exist while five other platforms describe sub-account structures ^[148]. Pricing conflicts for Vendasta, where official pages show both a $99 monthly minimum and a $499 Professional minimum ^[205]. Product availability is disputed for IGSendMail, where Kimi reports no retrievable product information while five other platforms describe detailed agency features ^[67]. White-label scope conflicts for ActiveCampaign, where one source states there is no white-label UI and another states per-account white-labeling is available for Enterprise ^[211].

How to compare your options

Questions explored

• What should a buyer check before choosing an agency marketing automation platform for multiple client accounts?
• Which agency marketing automation platform should a buyer choose if they need both reseller discounts and white-label client portals?

Start with the architecture question. If the agency needs separate client accounts with reseller discounts and is comfortable carrying client billing, ActiveCampaign is the consensus first choice ^[136]. If the agency needs a white-label client portal and a resellable services catalog, Vendasta is the strongest alternative ^[204]. If the agency wants a branded platform with master/sub-account switching and reusable assets, VBOUT is the best-ranked option ^[60]. If the agency needs isolated client accounts with centralized administration and is willing to negotiate an Enterprise contract, Brevo fits ^[48]. If the agency is email-first and wants markup billing with white-label reporting, Campaign Monitor has the best average listed position ^[155]. If the agency has DevOps capability and wants one-time licensing, Interspire Email Marketer or Acelle Send fit ^[172]. If the agency wants the lowest all-in cost with isolated workspaces, systeme.io fits ^[95]. If the agency wants fixed send-volume pricing with unlimited contacts, IGSendMail is a candidate pending verification ^[75].

Then verify the four contested capabilities in writing: tenant isolation depth, permission granularity for agency staff, white-label report coverage, and billing pass-through mechanics. Every ranked entity has at least one documented gap in these areas.

Methodology

This study used one standardized prompt sent once to each of 7 included platforms: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. The prompt asked which providers would be recommended for a marketing agency running campaigns for a growing roster of separate clients from a single platform, with clean separation between client accounts, white-label reporting, reseller-friendly pricing, and billing pass-through where needed.

The ranking rule is platform mentions first, then average listed position, then best listed position. The final ranking table is the sole authority for rank, platform mentions, platform share, average rank, and best rank. Platform mentions count only ranking-discovery mentions and are not the same as the number of platforms that later completed a fit assessment.

Eligibility required an entity to be named by at least two platforms. Of 27 unique entities named, 9 qualified. Entity evidence bundles supplied buyer fit, features, pricing, strengths, limitations, disagreements, and citations. Company-owned citations materially outnumber independent citations across the evidence set, and no company claim should be read as independently verified.

Research limitations

• One standardized prompt was sent once to each platform. AI answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved.
• Platform-reported research dates differ from the authoritative run date of 2026-10-01. Deepseek reported 2026-01-15 for ActiveCampaign, Vendasta, Brevo, Campaign Monitor, and systeme.io; 2026-06-08 for VBOUT; 2026-04-25 for Interspire Email Marketer; 2026-01-10 for IGSendMail; and 2026-02-14 for Acelle Send. Anthropic reported 2026-01-15 for IGSendMail and 2026-01-13 for Acelle Send. These dates are provenance metadata and do not independently prove freshness.
• Platform recommendations are market intelligence, not independent customer reviews or proof of quality.
• Company-owned citations materially outnumber independent citations. Do not describe company claims as independently verified.
• The supplied URLs were collected from platform responses and were not independently validated by the writer stage.
• Citations are platform-reported evidence, not independently verified facts. No-search model claims require explicit verification before being described as current facts.
• IGSendMail has no deduplicated independent citation in the supplied catalog; its evidence base is company-owned or platform-reported.
• Six of seven included platforms returned a usable fit assessment for Brevo; the fit findings for Brevo are not unanimous.
• The deterministic identity audit notes that official-site retrieval failed for one or more mentions for ActiveCampaign, Vendasta, VBOUT, and systeme.io, and that a product-labeled company mention was merged using matching company-name and supplied-domain signatures. Identity details from those merges should be treated as unverified.
• Conflicting product names, pricing, and capabilities were described rather than resolved. Buyers should verify each conflict directly with the vendor.

The consensus assessment

ActiveCampaign is the consensus leader for agency multi-client marketing automation in this 7-platform study, named by 5 of 7 platforms with the strongest documented reseller discount structure and the most consistently described partner portal. Vendasta ties on mentions and is the strongest alternative for agencies that need a white-label client portal and a resellable services marketplace. VBOUT is the best fit for agencies that want a branded platform with master/sub-account switching and reusable campaign assets. Brevo fits agencies that need isolated client accounts with centralized administration and will negotiate an Enterprise contract. Campaign Monitor has the best average listed position of any qualifier and fits email-first agencies that want white-label reporting and markup billing. Interspire Email Marketer and Acelle Send fit technically capable agencies that want self-hosted control and one-time licensing. systeme.io fits agencies that want the lowest all-in cost with isolated workspaces. IGSendMail is a candidate for email-focused resellers pending written verification of plan entitlements. No entity is best overall outside this defined use case, and every ranked entity has at least one documented gap that buyers should verify before purchase.

Frequently Asked Questions

How many platforms were studied? Seven: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. One standardized prompt was sent once to each.

How many entities qualified? Nine of 27 unique entities named, using the rule that an entity must be named by at least two platforms.

Which platform was named by the most AI platforms? ActiveCampaign and Vendasta each were named by 5 of 7 platforms (71.4%).

Which platform had the best average listed position? Campaign Monitor, at 2.5, but it was named by only 2 platforms.

Does a higher rank mean the platform is best for every agency? No. The ranking reflects cross-platform consensus for this specific use case, not universal suitability. Buyer fit varies by architecture, white-label depth, billing model, and technical capability.

Are the prices in this article verified? No. Prices are platform-reported or company-published and were not independently validated. Several entities have conflicting pricing across sources, and buyers should confirm current terms directly.

Can AI answers change? Yes. AI answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved.

Sources used in this study

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119. VBOUT Help - Custom Plans and Agency Settings: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGwqm3x_SPaspuG9R7RyZjg-JQ9Uh3Ey9fIpGtiDD8AlSCn-DErlcrddGqRPWn61ugnhPPrBq5wj8KwJzZeMkrc2UidjtUWOUbY6esJWWw8ywNJSoi4WFsMEVxuEHO1JQ_g1Xa-gpTzTbZhdhZGaoCCkVi4yKXjDLwWzA==
120. Mark up client prices - Support: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQGZK3Gbm9pJJRU3Q_vDbCEo-Zj7v7pXA8mbJUiJvBzKVmefFn2c21u01FtW1q8HrQIAoTq8RCN29jDCn9Fed9PR2SsxvDA6prMdnEWvAesLqn7ksBNNfXAK0UFSyR84IfCK7UVz_Kfkq_kExKs=
121. Agency Partner Agreement - ActiveCampaign: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQH1CC7MS3ZZBZoFzqXp2ehMHNQQ46WcyhP03dgSVFPNSysrXgA4N674CerEg-40E6JkDcMtg0FV21WzuqW_cO5XsXPzJ5l5QeozOsutmhX-zVfV3Yrxjnc5u7ojXOh0MlrpvJFuxQe2CsvlL_dB2DmdOXpj
122. How to set up and configure the White Label feature and sell systeme.io accounts: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHE_bU6RB7U526FwFwdGTaFTiMX3h9y0sPAbdbGwEr5SgHMS-L0osonHfwcmMLvrM_gO4UO24oWJLE5doAH2CJvJU66mZoF_7y8eofBU7dUl1C0_lj99tmmskNhKbV2s_cEX3xfCHeb0ZC0R3oU9kF48xiq
123. About acellesend.com and AcelleMail: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHg9vOg-a0yM35olshjuyp3BqkEEHBhsbCnjh48A-L_-Sx4t2y88sdIcSJnOIsw4x5USqXarkcu7HodSavkQd6Kvh8UTcaeC3WPi7c2Ijs_ccCtb1G_DQ==
124. Subscriptions & client billing - Vendasta Documentation: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHPMN_ocy2ycZFsNN3nl7gpXrlBxP6Czg3UTC-r73XHefOSENcWElG97NaJe472AVwmPTt4Ej5zCnniTD6n3rJNanl9afXd63J3_7U5Sly9VE1qxXRkpa0a7un9MtTnYWeLtjNOhNSTVikgYdi_Tq-scCRrhXH_zsHJW6shA3ZAZiEfwf_skcMkQ5jnhlSixF_eQQ8axNuQ6dexxuZuTNs7raMmaRLh6wsrQsaadn53
125. Manage Custom Plans on VBOUT: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQHQPVPB4YqrEc7VYc55eSIWMA0hbw2rxSjOZ90ZNN9xzQCYjTkZX44D4yQ2gQlpLURrXkAWaXtNPZsBXEv9hoXayqTIRGXAbPOn6--wmKUc_8k4Aj2QEpc4eXFnuEiqA8rBiwMvuBLK6bhmnWojy5uG59Tiza1Sw2T4Tw==
126. Systeme.io White Label - Features, Pricing & How to Get Access: https://whitelabel-info.systeme.io/
127. AcelleMail for Agencies - White-label self-hosted email marketing: https://www.acellemail.com/for/agencies
128. ActiveCampaign Official Website: https://www.activecampaign.com/
129. FAQ: https://www.activecampaign.com/about/faq
130. ActiveCampaign Agency Partner Program: https://www.activecampaign.com/agency
131. Agency Partner Agreement: https://www.activecampaign.com/de/legal/agency-partner-agreement
132. Set user permissions in ActiveCampaign: https://www.activecampaign.com/learn/guides/user-permissions-in-activecampaign
133. White Labeling in ActiveCampaign: https://www.activecampaign.com/learn/guides/white-labeling-in-activecampaign
134. Agency Partner Agreement - ActiveCampaign: https://www.activecampaign.com/legal/agency-partner-agreement
135. Marketing Automation Software for Agencies & Consultants: https://www.activecampaign.com/partner
136. Become an Agency Partner: https://www.activecampaign.com/partners/agency
137. Official pricing and terms source: https://www.activecampaign.com/pricing/contact/
138. Brevo - Marketing, Automation, and Multi-Account Solutions: https://www.brevo.com/
139. Brevo Enterprise: https://www.brevo.com/enterprise/
140. Brevo Features: https://www.brevo.com/features/
141. Brevo Solutions Partner Program: https://www.brevo.com/partners/
142. Become a Brevo Agency Partner: https://www.brevo.com/partners/agencies/
143. Become a Brevo Expert Partner | Brevo Expert Program: https://www.brevo.com/partners/agencies/?tap_a=30591-fb13f0&tap_s=285081-6bc26f&tm_subid1=ett-en
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145. See All Features: https://www.brevo.com/pricing/see-all-features/
146. Pricing Plans | Brevo: https://www.brevo.com/tarifs/
147. Campaign Monitor - Official Website: https://www.campaignmonitor.com/
148. Email Marketing Software for Agencies: https://www.campaignmonitor.com/agencies/
149. We Reviewed 11 Email Marketing Platforms for Agencies - Here's Our Top Pick: https://www.campaignmonitor.com/blog/email-marketing/email-marketing-platforms-for-agencies/
150. 11 White-Label Email Marketing Platforms: https://www.campaignmonitor.com/blog/email-marketing/white-label-email-marketing-platforms/
151. Campaign Monitor vs. ActiveCampaign: Features, Pricing & Reviews: https://www.campaignmonitor.com/delivers/campaign-monitor-vs-activecampaign/
152. Campaign Monitor vs. Mailchimp for Agencies: https://www.campaignmonitor.com/delivers/why-campaign-monitor-beats-mailchimp-for-agencies/
153. Campaign Monitor vs. MailerLite for Agencies: https://www.campaignmonitor.com/delivers/why-campaign-monitor-beats-mailerlite-for-agencies/
154. Check out the Features Custom Built for Agencies: https://www.campaignmonitor.com/email/agency-features-tour/
155. Email Marketing Pricing | Campaign Monitor: https://www.campaignmonitor.com/pricing/
156. Email Marketing Pricing & Packages: https://www.campaignmonitor.com/pricing/?app=1
157. An Agency’s Guide to Email Marketing: https://www.campaignmonitor.com/resources/guides/email-marketing-and-automation-for-agencies/
158. What are the Campaign Monitor Pricing Tiers?: https://www.campaignmonitor.com/resources/knowledge-base/what-are-the-campaign-monitor-pricing-tiers/
159. Overview Page and User Permissions glossary term: https://www.campaignmonitor.com/resources/training-videos/campaign-monitor-101/video/overview-page-and-user-permissions/
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161. GoHighLevel for Marketing Agencies (2026): https://www.gohighlevel.ai/for/marketing-agencies
162. Interspire Email Marketer: Self-Hosted Email Marketing Software: https://www.interspire.com/
163. Groups: https://www.interspire.com/docs/v8/ag/groups
164. Administrator Guide Introduction: https://www.interspire.com/docs/v8/ag/introduction/
165. Users and Groups: https://www.interspire.com/docs/v8/ag/users-and-groups
166. Users and Groups: https://www.interspire.com/docs/v8/ug/users-and-groups/
167. Users and Groups | Documentation - Interspire: https://www.interspire.com/documentation/users-and-groups/
168. INTERSPIRE EMAIL MARKETER: https://www.interspire.com/downloads/interspire-email-marketer-user-guide-1.3-20180417.pdf
169. Email Marketing Software for Agencies: https://www.interspire.com/email-marketing-software-for-agencies/
170. Email Marketer Features: https://www.interspire.com/emailmarketer/
171. How to Choose the Right VPS for Self-Hosted Email Marketing - Interspire: https://www.interspire.com/how-to-choose-the-right-vps-for-self-hosted-email-marketing/
172. Pricing - Own Your Email Marketing with a One-Time Purchase: https://www.interspire.com/pricing/
173. Rebranding & White Labeling - Interspire: https://www.interspire.com/rebranding-private-labeling/
174. Release Notes - Interspire: https://www.interspire.com/release-notes/
175. Choosing between SaaS vs Self-Hosted Email Marketing Software - Interspire: https://www.interspire.com/saas-vs-self-hosted/
176. Sending Rates & Limitations - Interspire: https://www.interspire.com/sending-rates-limitations/
177. Email Marketing Software for Agencies - Interspire: https://www.interspire.com/solutions/agencies/
178. White-Label Email Marketing for Hosting Providers - Interspire: https://www.interspire.com/solutions/hosting/
179. How to Choose the Right VPS for Self-Hosted Email Marketing - Interspire: https://www.interspire.com/vps-for-email/
180. Marketing Automation for Agencies - White-Label: https://www.seekadu.com/ai-marketing-automation/agencies
181. AI Marketing for Agencies - Manage Multiple Clients with One AI Agent: https://www.sprites.ai/agencies
182. VBOUT official website: https://www.vbout.com/
183. Marketing Automation for Agencies • VBOUT: https://www.vbout.com/agency/
184. VBOUT blog / agency-related content: https://www.vbout.com/blog/
185. The Complete Guide to Marketing Automation for Agencies: Scale Smarter, Not Harder • VBOUT: https://www.vbout.com/blog/the-complete-guide-to-marketing-automation-for-agencies-scale-smarter-not-harder/
186. Adaptive Marketing Automation Platform: https://www.vbout.com/home-v1/
187. AI-Enabled Platform - Plans and Pricing - VBOUT: https://www.vbout.com/pricing/
188. How To Scale Your Agency By Leveraging Our White-Labeled, AI-Powered Marketing Automation Solution • VBOUT: https://www.vbout.com/scale-agency-leveraging-white-labeled-ai-powered-marketing-automation-solution/
189. Official pricing and terms source: https://www.vbout.com/terms-of-service/
190. Deterministic ranking stage normalization audit context: https://www.vendasta.com/
191. Vendasta Billing and Payments: https://www.vendasta.com/billing/
192. The Beginner's Guide to Client Management for Digital Marketing Agencies: https://www.vendasta.com/blog/client-management/
193. 150+ Vendasta FAQs: Everything You Need to Know: https://www.vendasta.com/blog/vendasta-faqs/
194. What the Heck Does Vendasta Do?: https://www.vendasta.com/blog/what-the-heck-does-vendasta-do/
195. White-Label Client Portal: Empower Your Clients, Strengthen Your Brand: https://www.vendasta.com/blog/white-label-client-portal/
196. Top White Label Marketing Tools for Scalable Growth in 2026: https://www.vendasta.com/blog/white-label-marketing-tools/
197. The ultimate guide to using a white label marketing platform: https://www.vendasta.com/blog/white-label-platform/
198. The Ultimate Guide to White Label Reporting: https://www.vendasta.com/blog/white-label-reporting/
199. Vendasta vs HubSpot: Marketing & AI Comparison: https://www.vendasta.com/compare/vendasta-vs-hubspot/
200. White Label Marketing: https://www.vendasta.com/content-library/white-label-marketing/
201. The Vendasta Marketplace: 250+ Digital Solutions: https://www.vendasta.com/marketplace/
202. Vendasta Platform Overview: https://www.vendasta.com/platform/
203. Billing & invoicing software for agencies & enterprise: https://www.vendasta.com/platform/merchant-services/
204. Vendasta Pricing Plans: https://www.vendasta.com/pricing-b/
205. Vendasta Pricing: Plans from $99/mo: https://www.vendasta.com/pricing/
206. Vendasta White-Label Solutions: https://www.vendasta.com/white-label/
207. Agency 9 3 Managing clients and sub-accounts: https://www.youtube.com/watch?v=YQVhkneB7v8

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