As an agency, which email and automation platforms offer white-label options to present them under the agency’s own brand?

Several top-tier email marketing and marketing automation platforms offer robust white-label or private-label capabilities tailored specifically for agencies . These options allow you to replace platform logos, use custom domains, and present a seamless, branded environment to your clients.

1. ActiveCampaign (Best for Advanced Automation & CRM)

• What you can brand: Custom login domains (e.g., ://youragency.com ), your own agency logo, custom color schemes (CSS/HTML tweaks), and fully removed vendor references.
• Agency benefits: Under their Enterprise/Reseller tiers, ActiveCampaign allows you to set your own pricing for clients, bundle automation/CRM services, and manage sub-accounts from a unified master dashboard.
• Learn more: Explore the ActiveCampaign Agency Partner Program.

2. Campaign Monitor (Best Classic White-Label Experience)

• What you can brand: Custom client-facing login URLs, brand logos, and custom color pallets inside client dashboards.
• Agency benefits: Long regarded as a gold standard for agency white-labeling, Campaign Monitor lets you provide clients with their own login access while keeping your agency’s brand front and center. It also includes client billing markups so you can control and profit from the software margins.
• Learn more: Check out Campaign Monitor for Agencies.

3. Mailjet (Best for Embedded/API White-Labeling)

• What you can brand: The entire user interface, reporting dashboards, and infrastructure via flexible white-label and embedded reseller programs.
• Agency benefits: Mailjet is designed so that digital agencies and developers can embed email creation, delivery, and analytics directly into their own tech stacks or proprietary client portals.
• Learn more: Review options on the Mailjet Embedded & Reseller Program.

4. GetResponse (Best for All-in-One Content & Webinars)

• What you can brand: Custom domains, logos, and branded client management portals on their higher-tier Creator and Enterprise plans.
• Agency benefits: Beyond standard email automation, it allows agencies managing multiple clients to package extra features like built-in webinars, landing pages, and course funnels under their own brand name.
• Learn more: Discover plans via GetResponse.

If you'd like to narrow this down, tell me:

• Do you need client-facing logins where clients log in themselves, or just white-label reporting/emails?
• What is your monthly client volume / budget range?

I can help you pick the most cost-effective platform for your agency model.

Yes. If your goal is to sell email marketing/automation as an agency-owned service, there are several options—but they differ substantially in how “white label” they really are.

1. gohighlevel.com — probably the strongest overall agency option

HighLevel is specifically designed around the agency/reseller model. On its agency plans, you can put your logo, domain and pricing on the platform and sell it to clients as your own SaaS. It includes CRM, email, SMS, funnels, calendars and workflow automation—not merely email.

Best if: you want to sell something like “YourAgency Marketing Platform” rather than just email services.

2. activecampaign.com — best for sophisticated automation

ActiveCampaign has an explicit White Label Agency/Reseller program. Agencies can offer the platform under their own brand/trademarks, use their own domain, create client accounts and bill clients themselves.

This is particularly interesting if your agency sells customer journeys, lead nurturing, segmentation and complex lifecycle automation.

Best if: automation sophistication matters more than having an all-in-one CRM/SaaS platform.

3. agency.transpond.io — purpose-built for agency white-labeling

Transpond explicitly offers white-label domains, custom branding, account management and bespoke billing. Your clients can access the service through your own domain, with your agency's branding.

Best if: you want a relatively focused white-label email marketing product rather than a giant CRM.

4. acellesend.com — best for ownership/control

AcelleMail takes a different approach: it's self-hosted, with a multi-tenant customer/plan system. You can run it on an agency domain, create client accounts, control billing and connect your own SMTP infrastructure.

That can be attractive if you want to build a genuine agency-owned email platform and avoid paying a SaaS provider indefinitely per client/subscriber.

Trade-off: considerably more technical responsibility.

5. getsendwave.com — dedicated white-label ESP

SendWave positions itself specifically as a white-label email platform for agencies, consultants and resellers. It provides a branded dashboard/domain, multi-tenant client management, campaigns, automation and analytics underneath your brand.

Best if: you want to turn email marketing itself into a branded agency product/SaaS.

6. nexuspromail.com — reseller/dealer model

NexusProMail has a dealer program aimed at agencies and resellers, allowing you to sell email marketing under your own brand, pricing and client relationship.

One important distinction: MailerLite

MailerLite is quite agency-friendly—you can manage multiple client accounts from one login—but it does not offer a native white-label/reseller version. MailerLite explicitly says that agencies wanting a branded dashboard would need to build one using its API.

My shortlist

If I were evaluating these specifically for an agency product, I'd narrow it to:

1. HighLevel — best overall for white-label SaaS + CRM + email + automation.
2. ActiveCampaign — best for serious marketing automation.
3. Transpond — best if you want a clean, email-focused agency offering.
4. AcelleMail — best if ownership, customization and economics are more important than simplicity.
5. SendWave — worth investigating if your core business model is reselling email infrastructure as your own platform.

The key question is whether you mean “clients don't see the underlying vendor” or “we want to actually sell this as our own SaaS, with our own pricing, domain, billing and client portal.” The latter dramatically narrows the field.

HighLevel is specifically designed around the agency/reseller model. On its agency plans, you can put your logo, domain and pricing on the platform and sell it to clients as your own SaaS. It includes CRM, email, SMS, funnels, calendars and workflow automation—not merely email.

Best if: you want to sell something like “YourAgency Marketing Platform” rather than just email services.

2. activecampaign.com — best for sophisticated automation

ActiveCampaign has an explicit White Label Agency/Reseller program. Agencies can offer the platform under their own brand/trademarks, use their own domain, create client accounts and bill clients themselves.

This is particularly interesting if your agency sells customer journeys, lead nurturing, segmentation and complex lifecycle automation.

Best if: automation sophistication matters more than having an all-in-one CRM/SaaS platform.

3. agency.transpond.io — purpose-built for agency white-labeling

Transpond explicitly offers white-label domains, custom branding, account management and bespoke billing. Your clients can access the service through your own domain, with your agency's branding.

Best if: you want a relatively focused white-label email marketing product rather than a giant CRM.

4. acellesend.com — best for ownership/control

AcelleMail takes a different approach: it's self-hosted, with a multi-tenant customer/plan system. You can run it on an agency domain, create client accounts, control billing and connect your own SMTP infrastructure.

That can be attractive if you want to build a genuine agency-owned email platform and avoid paying a SaaS provider indefinitely per client/subscriber.

Trade-off: considerably more technical responsibility.

5. getsendwave.com — dedicated white-label ESP

SendWave positions itself specifically as a white-label email platform for agencies, consultants and resellers. It provides a branded dashboard/domain, multi-tenant client management, campaigns, automation and analytics underneath your brand.

Best if: you want to turn email marketing itself into a branded agency product/SaaS.

6. nexuspromail.com — reseller/dealer model

NexusProMail has a dealer program aimed at agencies and resellers, allowing you to sell email marketing under your own brand, pricing and client relationship.

One important distinction: MailerLite

MailerLite is quite agency-friendly—you can manage multiple client accounts from one login—but it does not offer a native white-label/reseller version. MailerLite explicitly says that agencies wanting a branded dashboard would need to build one using its API.

My shortlist

When searching for an email and marketing automation platform that allows true white-labeling (rebranding the interface with your agency's logo, colors, and custom domain), options generally fall into two categories: all-in-one CRM & marketing automation platforms built specifically for agency resale , and traditional email service providers (ESPs) with partner/reseller tiers.

The top platforms offering robust white-label and agency-reselling options include:

• GoHighLevel
  • Best for: Complete SaaS rebranding and recurring software revenue.
  • White-Label Features: Offers full white-labeling including custom agency domains (CNAME), your own agency logo, color schemes, mobile app branding, and custom CSS/JS. It bundles email marketing, SMS automation, pipelines, and a full CRM that you can resell to clients under your own brand.
• • Best for: A dedicated, modular marketing automation suite that feels native to your agency.
  • White-Label Features: Highly rebrandable with custom domains, agency logos, and color palettes. It also includes a custom plan and pricing builder so you can package email marketing, social, and lead-gen tools and bill clients directly under your own brand.
• ActiveCampaign (Reseller/Agency Partner Program)
  • Best for: Advanced, powerhouse email logic and deep automation.
  • White-Label Features: Through their agency partner/reseller tiers, you can manage multiple client sub-accounts from a single master login, apply custom branding, and get volume discounting, though depth of domain-level white-labeling depends on your exact partner agreement.
• Mailjet (Reseller/Custom Plans)
  • Best for: Developer-heavy or high-volume sending agencies.
  • White-Label Features: Offers robust white-label capabilities via custom-tailored partner programs and APIs, allowing you to embed their robust email builder and infrastructure directly into your own proprietary or agency-branded ecosystem.
• BigMailer
  • Best for: Agencies managing multiple discrete client brands or franchises.
  • White-Label Features: Built specifically with agencies in mind, allowing multi-account management, custom domains, and client-facing dashboards that keep your agency front-and-center.

If you'd like to narrow this down, tell me:

• Do you want to resell the software as a SaaS product (billing clients monthly for access) or just manage the emails behind the scenes?
• What is your monthly budget or number of clients?

I can help you pick the exact platform and plan tier that fits your agency model.

Yes. If by white-label you mean clients log into a platform that carries your agency’s name, domain, logo, colors, and emails, rather than merely having an “agency” account, there are several options.

Strongest options

A few deserve special attention:

• HighLevel — probably the most established choice if you're selling a complete marketing platform rather than just email. It supports white-labeling, custom domains, client accounts, CRM, funnels, email, SMS and workflows. The tradeoff is that you're buying into a fairly large ecosystem rather than a purpose-built email platform.
• Transpond — particularly interesting if your agency's core product is email marketing + automation. Its agency offering explicitly includes white-label dashboards, campaigns, reporting, client management and reusable automations.
• ActiveDEMAND — a stronger candidate for B2B agencies that need serious automation, CRM integration, attribution and reporting. It explicitly advertises full white-labeling and branded client dashboards.
• Mailmunch — worth looking at if you want sophisticated email automation, lead capture, scoring and behavioral workflows under your agency brand.
• Mailazy — more interesting if you want to make email part of your own software/service offering. It supports custom domains, UI branding, custom billing and removal of Mailazy branding, with both marketing automation and API/SMTP capabilities.
• AcelleMail — the unusual option because it's self-hosted. You can run it on your own domain, use your own SMTP infrastructure/provider, create client tenants and control billing. This gives an agency considerably more ownership, but also puts hosting, security and deliverability responsibility on you.
• SendWave — explicitly designed as a white-label, multi-tenant email platform for agencies, with your own domain, client accounts, automation, analytics and pricing.

One important distinction

A lot of platforms advertise themselves as “agency-friendly” without being genuinely white-label.

For example, an agency plan might give you:

Agency account → manage Client A, Client B, Client C …but the client still sees Mailchimp/Klaviyo/ActiveCampaign when they log in.

True white-label generally means:

youragency.com → your logo → your colors → your client dashboard → your billing/support identity Some platforms also go further and let you resell the software as your own SaaS, set your own prices, and provision client accounts automatically. That distinction is particularly important if your objective is to turn email/automation into a recurring agency revenue product rather than simply use software internally.

My shortlist by agency model

• Want the safest all-around agency choice: HighLevel
• Primarily an email/automation agency: Transpond or Mailmunch
• B2B / sophisticated automation: ActiveDEMAND
• Want to actually build your own branded email SaaS: Mailazy or AcelleMail
• Want a dedicated white-label email-reselling business: SendWave
• Want funnels + CRM + email under one brand: systeme.io

If you tell me how you want to package this for clients (e.g. “we manage email for them” vs. “clients log into our own platform and pay us monthly”), I can narrow this to the 3 best platforms and compare pricing, white-label limitations, API access, client billing, and automation capabilities.

…but the client still sees Mailchimp/Klaviyo/ActiveCampaign when they log in.

True white-label generally means:

youragency.com → your logo → your colors → your client dashboard → your billing/support identity Some platforms also go further and let you resell the software as your own SaaS, set your own prices, and provision client accounts automatically. That distinction is particularly important if your objective is to turn email/automation into a recurring agency revenue product rather than simply use software internally.

My shortlist by agency model

When looking for email and marketing automation platforms that allow true white-labeling (rebranding the interface, custom domains, and removing third-party logos entirely so your clients only see your agency's brand), several top-tier options stand out.

The leading platforms offering dedicated agency white-label capabilities include:

• GoHighLevel (HighLevel) : Widely considered the gold standard for all-in-one agency reselling. It offers a complete white-label mobile app, custom desktop domain, agency-branded dashboards, and robust email/SMS automation built on top of a powerful CRM.
• ActiveCampaign (Enterprise/Reseller Tier) : Through their higher-tier agency partner and reseller programs, you can rebrand client sub-accounts with your own logo, custom color schemes, custom tracking domains, and application names. It remains the top choice if your primary focus is deep, complex behavioral email automation.
• Campaign Monitor (Agency Reseller Plan) : Built natively with an agency-first model. It allows you to manage multiple client accounts from a single dashboard, completely hide Campaign Monitor branding, use custom domains for client access, and set your own pricing margins.
• BigMailer : A scalable email marketing tool that integrates with Amazon SES. Its top-tier agency plan supports full white-labeling, letting you use your own custom login domain, logos, and distinct client workspaces.
• Saleshandy : Ideal if your agency focuses heavily on cold email outreach and sales sequences. They offer a dedicated white-label solution allowing custom analytics and dashboard domains under your own brand name.

If you'd like to narrow this down, tell me:

• What is your primary channel focus (bulk newsletters, behavioral drip campaigns, or cold email outreach)?
• Do you need client-facing mobile apps or just a branded web portal?

I can help compare the pricing structures and feature limits of the best fit for your stack.

Yes. If your goal is to sell email marketing/automation as an agency-owned platform—where clients log into your domain, see your branding, and ideally never see the underlying vendor—there are a few strong options. The important distinction is between true SaaS white-labeling and merely removing a logo from emails.

Best options for agencies

1. HighLevel — probably the strongest overall choice

HighLevel is specifically designed around the agency-reseller model. Its SaaS mode lets agencies sell the platform under their own brand, with custom domains and branding; the platform includes email, workflows, CRM, funnels, calendars, SMS, reputation management and more.

This is the one I'd investigate first if you're thinking:

"I want to give every client an account at app.myagency.com and charge them $X/month for our proprietary marketing platform."

HighLevel also introduced SaaS Multi-Brands in 2026, allowing eligible agencies to manage multiple independent brand identities, domains and white-label configurations from one SaaS account.

Best for: productized agency services, local-business marketing, lead generation, CRM + email + SMS.

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2. ActiveCampaign — strongest if email automation is the core product

ActiveCampaign's agency/partner program is worth looking at if you want the underlying engine to be genuinely strong at email automation rather than primarily a CRM/funnel platform.

ActiveCampaign currently advertises agency reselling and white-label opportunities, including customized look and feel and agency-controlled billing.

The attraction is its sophisticated automation: segmentation, behavioral triggers, lead scoring, journeys, email sequences, etc.

Caveat: I'd distinguish this from HighLevel's "build your own SaaS" experience. ActiveCampaign's agency/reseller offering is more partnership-oriented, so you'd want to confirm exactly which client-facing elements can be branded under the specific reseller arrangement you negotiate.

Best for: an agency selling a premium email automation service rather than an all-in-one CRM.

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3. Vendasta — excellent for a broader white-label agency marketplace

Vendasta takes a somewhat different approach. Rather than just giving you an email platform to rebrand, it is built around agencies reselling a collection of digital products/services under their own brand.

Its white-label experience can cover the client portal, marketplace, mobile app and other parts of the platform.

So if your offer is something like:

"Our agency's digital growth platform"

with email + reputation management + listings + SEO + advertising + AI services, Vendasta becomes particularly interesting.

Best for: agencies building a multi-service recurring-revenue product.

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4. Brevo — good if you mainly need branded email

Brevo is attractive if you don't need the full "our own SaaS" experience and primarily want agency/client management around email marketing and automation.

It is frequently included among agency white-label options, although its white-label capabilities aren't as comprehensive as HighLevel's.

Best for: cost-conscious agencies where email/SMS automation is the primary deliverable.

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5. Mailjet — worth considering for email infrastructure

Mailjet has agency-oriented capabilities including subaccounts and reseller arrangements. It's particularly interesting when you need both marketing and transactional email rather than a CRM-heavy system.

Best for: agencies providing email infrastructure/services to multiple businesses.

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One important distinction

Don't confuse these three things:

1. Email white-labeling — your clients' emails don't show the vendor's branding.
2. Agency/reseller white-labeling — clients can use the software under your agency's name.
3. Full SaaS white-labeling — clients log into something like app.youragency.com, see your logo/colors/domain, and you sell subscriptions to the platform as your own product.

If #3 is what you mean, I'd narrow the field considerably:

🥇 HighLevel → best overall for agency-owned SaaS
🥈 Vendasta → best for a broader resold marketing-services marketplace
🥉 ActiveCampaign → best when sophisticated email automation is the centerpiece

If you tell me whether you want to resell just email automation or a complete CRM/marketing platform, I can also compare the white-label capabilities, pricing, margins, client limits, custom domains, mobile apps, API access, and whether clients can discover the underlying vendor for the top 5.

When looking for platforms that let you fully brand email marketing and automation under your agency’s own identity (custom domains, logos, color schemes, and no third-party vendor names visible to clients), the options generally fall into two categories: all-in-one white-label CRM/automation ecosystems built explicitly for resale, and traditional email platforms with robust agency/reseller tiers.

The top platforms offering true or robust white-label and agency-branded options include:

• GoHighLevel (HighLevel)
  • Best For: Agencies wanting a complete, turn-key SaaS resale model.
  • White-Label Features: Full rebranding across the board—custom desktop app domains, mobile apps, logos, color schemes, customized menu items, and client login screens. It includes multi-channel automation (email, SMS, voice, and pipelines) that clients log into as if it were your proprietary software.
• Vendasta
  • Best For: Agencies scaling local business (SMB) services.
  • White-Label Features: Provides a branded client portal where customers access email marketing, listings, social, and sales automation. It includes automated fulfillment and a massive marketplace of digital products you can markup and brand as your own.
• ActiveCampaign (Reseller/Enterprise Plans)
  • Best For: Data-driven marketing agencies requiring advanced, deep automation.
  • White-Label Features: High-tier agency plans offer custom domain mapping, branded tracking links, and the ability to provision and manage sub-accounts for clients from an agency dashboard, keeping your brand front and center during campaign execution.
• BigMailer.io
  • Best For: Agencies and franchises managing multiple distinct brands or clients.
  • White-Label Features: Allows you to host the email marketing platform on your own custom domain with your logo, completely stripping out references to BigMailer, alongside offering customized templates and distinct brand partitioning.
• DashClicks
  • Best For: Operations-heavy agencies wanting a software-and-fulfillment combo.
  • White-Label Features: Offers custom-branded user dashboards, tracking, and instant client reporting tools spanning automation, email, and ad performance.
• Brevo (formerly Sendinblue) / BrevoPlus
  • Best For: API-centric or multi-channel communication needs (Email, SMS, WhatsApp).
  • White-Label Features: Enterprise/agency configurations allow for custom sending domains and branded interfaces, though some deeper integrations require technical setup.

To help narrow down which platform fits your workflow, tell me:

• Are you looking to resell the software as your own product (SaaS model) or just manage campaigns behind the scenes?
• What other channels (like SMS, social scheduling, or CRM pipelines ) do you need bundled in?

Yes. If you want clients to see your agency’s name, domain, logo, and pricing rather than the underlying vendor, there are several good options. The important distinction is between true white-label/reseller platforms and tools that merely offer an agency dashboard.

Strongest options for agencies

My top 3

1. HighLevel — best overall for a marketing agency

If your goal is something like “Acme Digital Marketing Platform” where clients log into a portal branded as your agency, HighLevel is probably the most straightforward option. Its Agency Pro offering supports your own logo, domain and pricing, and the platform combines CRM, email, SMS, funnels, calendars and automation.

This is particularly attractive if you want to charge clients $X/month for your proprietary marketing platform rather than simply manage their Mailchimp/ActiveCampaign account.

2. ActiveCampaign — best for serious email automation

ActiveCampaign has an actual White Label Agency Partner Program, allowing agencies to offer its services under their own brand and bill clients themselves.

I'd favor this if your core proposition is sophisticated lifecycle marketing: lead nurturing, segmentation, behavioral automation, sales automation, etc., rather than an all-in-one agency CRM.

3. AcelleMail — best if you want to own the infrastructure/software layer

Acelle is interesting because it's self-hosted and source-code based. You can run it on your own domain, use your own branding, create separate client accounts/plans, and connect whatever SMTP infrastructure you prefer.

That gives you considerably more control than a conventional SaaS reseller arrangement, although you're also taking on more technical responsibility.

One important distinction

If by “email platform” you mean business email hosting (e.g., giving each client [email protected]), rather than email marketing, look at Atriomail. It specifically offers white-labeled mailboxes, custom login domains, branding, automated DNS configuration, and API provisioning for agencies/resellers.

If you mean marketing email + workflows (newsletters, lead nurturing, abandoned-cart sequences, CRM triggers, etc.), I'd narrow the list to HighLevel, ActiveCampaign, AcelleMail, SendWave, and NexusProMail.

One notable exclusion: MailerLite explicitly says it does not offer a white-label/reseller version of its app, despite having good agency account-management features.

If you tell me whether you're trying to sell (a) email marketing, (b) business email hosting, or (c) a complete white-label CRM/marketing platform, I can narrow this down to the 3–5 best choices and compare their pricing, margins, client limits, API access, and branding capabilities.

Several email marketing and automation platforms provide robust white-labeling or reseller capabilities, allowing agencies to replace the vendor's branding with their own logo, custom domain, and color palette.

The top options on the market vary depending on your agency's exact needs, ranging from full-stack marketing CRMs to specialized email tools.

• HighLevel (GoHighLevel)
  • Best For : Full-service agencies wanting to run a complete SaaS model.
  • White-Label Features : Offers a 100% white-labeled desktop and mobile app. You can completely customize the logo, color schemes, custom login domain, and menu options. It bundles heavy-duty email/SMS automation, pipelines, and a full CRM.
• Campaign Monitor
  • Best For : Traditional digital and creative agencies managing high-volume senders.
  • White-Label Features : Known as an industry standard for agency reselling. Allows you to rebrand the entire client interface, customize reports, use your own custom domains, and manage bespoke client billing.
• BigMailer
  • Best For : Agencies or franchises managing multiple separate brands and distinct client sub-accounts.
  • White-Label Features : Lets you host the platform on your own custom domain, remove all native platform references, inject your logo, and offer branded template libraries to your clients.
• Simvoly
  • Best For : Web design and digital agencies adding marketing and funnels to their toolkit.
  • White-Label Features : Provides platform skinning, custom domains, non-branded educational academies, and integrated drag-and-drop email/automation builders under your own brand.
• ActiveCampaign
  • Best For : Agencies prioritizing advanced, data-driven automation and deep CRM configurations.
  • White-Label Features : Features a comprehensive Reseller/Agency Partner program that allows custom client account management and branded reporting structures, though UI customization varies by partner tier.
• Transpond
  • Best For : Lean agencies looking for flexible pricing and custom mail server options.
  • White-Label Features : Offers custom branding for client dashboards, custom white-label login domains, and bespoke billing structures where you set the margins for your clients.

To help narrow down the right fit, let me know:

• Are you looking to resell the software as your own SaaS , or do you just need branded client reporting?
• What core features are a must-have (e.g., SMS, advanced workflows, e-commerce integrations like Shopify)?

Yes. If by white-label you mean the client can log into a platform at something like app.youragency.com, see your logo/branding, and ideally never know which underlying vendor powers it, there are several options—but they vary considerably in how “white” the label actually is.

Best options for agencies

1. GoHighLevel — probably the strongest overall agency choice

GoHighLevel is specifically built around the agency/reseller model. Its SaaS Mode lets an agency offer CRM, email/SMS, funnels, calendars, workflows, etc. as an agency-branded product. Current documentation describes custom domains, agency branding and client subaccounts as part of the white-label model.

Particularly good if you want to sell:

“Our proprietary marketing automation platform”

rather than:

“We manage your GoHighLevel account.”

The big advantage is that email is only one component. You can package CRM + lead capture + nurturing + SMS + appointment booking + automation under the same agency brand.

My pick for: most digital/lead-gen agencies.

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2. Vendasta — best if you're building a broader reseller marketplace

Vendasta is more of a white-label product/reseller ecosystem than an email-first platform. Agencies can put their own branding around a client portal and resell a range of marketing products, with email being one component.

This makes sense if your offer is something like:

Agency Platform

• Email marketing
• Reputation management
• SEO
• Listings
• Social
• Advertising
• CRM
• Reporting

rather than an email-centric SaaS.

My pick for: agencies wanting to resell a suite of marketing services.

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3. AcelleMail — interesting if you want genuine ownership

AcelleMail is quite different.

It's self-hosted, with a multi-tenant customer/plan system. You can operate it on your own agency domain, use your own branding, control the SMTP infrastructure, and charge your clients yourself.

That gives you substantially more control than simply putting your logo on somebody else's SaaS.

Trade-off: you're taking on more responsibility for hosting, deliverability, updates, security and infrastructure.

My pick for: technically capable agencies that want to build a proprietary email SaaS.

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4. SendWave — dedicated white-label email SaaS

SendWave is explicitly positioned around agencies and resellers. It offers a branded platform, multi-tenant architecture and managed deliverability, with the client-facing interface operating under your domain/brand.

This is worth investigating if email itself is the product you're selling, rather than needing a CRM/funnel ecosystem.

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5. Mailjet — good infrastructure, but think “agency/reseller” rather than total white-label

Mailjet has agency-oriented capabilities, including subaccounts and reseller arrangements. It's particularly attractive if you need both marketing email and transactional/API email.

I'd consider it if your agency is building email functionality into another branded application rather than trying to give clients a completely rebranded ESP dashboard.

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What about ActiveCampaign?

ActiveCampaign is arguably one of the strongest email automation products here, but I'd distinguish it from a truly white-label platform.

It's excellent for:

• complex customer journeys
• segmentation
• lead scoring
• CRM
• behavioral automation
• sophisticated email sequences

But if your primary requirement is “client logs into our platform and sees absolutely none of the underlying vendor”, I'd put GoHighLevel/AcelleMail/SendWave ahead of it.

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And MailerLite?

Interestingly, MailerLite explicitly says it does not offer a white-label or reseller version. Agencies can manage multiple client accounts, and its API can be used to build your own branded dashboard, but that's different from having an officially white-labeled SaaS.

So I wouldn't choose MailerLite if true white-labeling is a hard requirement.

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How I'd narrow it down

If your agency sells marketing automation as a service:
→ GoHighLevel

If you want to sell a whole branded marketing platform:
→ Vendasta or GoHighLevel

If your core product is white-label email marketing:
→ SendWave or AcelleMail

If you need serious email infrastructure/API capabilities:
→ Mailjet

If automation sophistication matters more than white-labeling:
→ ActiveCampaign

One important distinction: “agency-friendly,” “reseller,” “custom branding,” and “true white-label” aren't synonymous. Before choosing, I'd specifically verify whether the vendor's name appears in the client login, emails/notifications, tracking URLs, sending infrastructure, help center, invoices, mobile app, and API—those are where supposedly white-labeled platforms often reveal the underlying provider.

If you tell me whether you're selling email as a standalone service or bundling it into a broader agency SaaS, I can narrow this to the 3 best platforms and compare pricing, client limits, domains, automation, SMTP/deliverability, and margins.