What is white label email marketing?

White label email marketing is when you use a third-party email platform to send campaigns and transactional emails under your own brand. Your customers see your domain and branding — not the email provider's. This is used by agencies managing clients, SaaS platforms offering email to their users, and resellers offering email marketing services.

Is Mailchimp a white label?

Mailchimp is not a true white label email platform. While paid plans allow you to remove the Mailchimp logo and use a custom domain, Mailchimp does not support multi-tenant architectures, per-customer domain isolation, or API-first white labeling for SaaS platforms. It is best suited for individual businesses or agencies that want basic brand customization.

Is white labeling illegal?

No, white labeling is a legal and standard business practice. It means rebranding a product or service provided by another company and offering it under your own brand. White label email marketing is used by thousands of agencies, SaaS platforms, and resellers worldwide.

What's the difference between white label email marketing and a white label email API?

White label email marketing platforms (like BigMailer or ActiveCampaign) provide a full email marketing UI that you rebrand for clients. White label email APIs (like Ark or Mailgun) provide email infrastructure via API that you embed into your own product. Agencies typically prefer marketing platforms. SaaS companies building email into their product typically prefer APIs.

Comparison Guide · 2026

Best White Label Email Marketing Platforms in 2026

White label email marketing platforms let you send branded email on behalf of your customers. But “white label” means different things depending on whether you're an agency or a SaaS platform.

This guide compares top platforms across two categories: agency-focused tools that offer a rebrandable email marketing UI, and API-first solutions that let SaaS platforms embed email sending into their own products.

Quick comparison

Platform	Best For	Type	Starting Price
Ark	SaaS platforms that need multi-tenant email	API	$29/mo
Mailgun	Developers who want raw email infrastructure	API	$0 – $35/mo+
Brevo (formerly Sendinblue)	Combining marketing and transactional email	API	$0 – $25/mo+
BigMailer	Agencies and franchises	Agency	$Free – $1,199/mo
ActiveCampaign	Per-account white labeling	Agency	$15/mo+
Mailmunch	Small agencies with landing pages	Agency	$Free – $99/mo

Pricing as of early 2026. Check each provider's site for current plans.

Category 1

API-first solutions for SaaS platforms

These platforms provide email infrastructure via API. You embed email sending into your own product — your customers never interact with the email provider directly.

Ark

Best for: SaaS platforms that need multi-tenant email

API

Ark is an email API built specifically for platforms. Native multi-tenant architecture with per-customer domain management, guided DNS onboarding, per-tenant suppression lists, and per-tenant analytics. Designed from the ground up for SaaS companies that send email on behalf of their customers.

Strengths

Native multi-tenant architecture (not bolt-on subusers)
Per-tenant suppression lists and bounce handling
Guided domain onboarding with DNS provider detection
Per-tenant analytics and usage metering via API

Limitations

No built-in campaign builder UI — API-first
Newer platform with smaller community

Starting at $29/mo

Learn more

Mailgun

Best for: Developers who want raw email infrastructure

API

Mailgun is a well-established email API with strong developer tooling. Supports custom domains and has a subuser system for basic multi-tenancy, though per-tenant management requires additional configuration.

Strengths

Mature API with extensive documentation
Strong deliverability track record
SMTP and API sending options

Limitations

Subuser system shares IP pools by default
Domain management is manual — no guided onboarding
Per-tenant analytics require custom implementation

Starting at $0 – $35/mo+

Learn more

Brevo (formerly Sendinblue)

Best for: Combining marketing and transactional email

API

Brevo offers both a marketing UI and transactional API. Supports custom domains and has some multi-user features, though not purpose-built for platform multi-tenancy.

Strengths

Combined marketing + transactional in one platform
Generous free tier with 300 emails/day
Built-in CRM and SMS

Limitations

No native multi-tenant architecture
White labeling is limited to logo removal on paid plans
API is secondary to the marketing UI

Starting at $0 – $25/mo+

Category 2

Agency-focused email marketing platforms

These platforms provide a full email marketing UI that you can rebrand for your clients. Best for agencies, franchises, and consultants who manage email campaigns on behalf of their customers.

BigMailer

Best for: Agencies and franchises

Agency

BigMailer offers full white label email marketing with custom branding, custom domains, and sub-account management. Designed for agencies that manage multiple clients from a single dashboard.

Strengths

Full white label UI with custom branding
Generous free tier for up to 1,000 contacts
Built-in campaign builder with templates

Limitations

No API for embedding into your own product
Not designed for SaaS multi-tenancy
Limited developer tooling

Starting at $Free – $1,199/mo

ActiveCampaign

Best for: Per-account white labeling

Agency

ActiveCampaign supports custom branding and custom domains on higher-tier plans. Strong automation and CRM features, but white labeling is an add-on rather than a core feature.

Strengths

Powerful marketing automation
Custom domain and branding options
CRM built into the platform

Limitations

White label features only on enterprise plans
Per-contact pricing gets expensive at scale
Not designed for platform multi-tenancy

Starting at $15/mo+

Mailmunch

Best for: Small agencies with landing pages

Agency

Mailmunch combines email marketing with landing pages and forms. Offers white label branding removal on paid plans, though primarily focused on lead generation.

Strengths

Integrated forms and landing pages
Affordable entry point
Easy to set up for simple campaigns

Limitations

Limited white label depth — mostly logo removal
No multi-tenant or sub-account support
Basic email sending capabilities

Starting at $Free – $99/mo

How to choose

If you're an agency managing clients' email campaigns…

Choose an agency-focused platform like BigMailer or ActiveCampaign. You get a ready-made email marketing UI that you can rebrand with your agency's logo and domain. Your clients log into your branded dashboard.

If you're building a SaaS product that sends email…

Choose an API-first solution. You need email infrastructure that embeds into your product — not a separate UI your customers log into. Look for native multi-tenancy, per-tenant data scoping, and guided domain onboarding. Ark is built for this — and our guide to sending from customer domains walks through the full architecture.

If you're a reseller offering email marketing services…

Either category could work depending on your model. If you want to offer a turnkey email marketing tool under your brand, go with an agency platform. If you're building email into a larger product, go API-first.

Frequently asked questions

Building a platform, not running an agency?

Ark is the white label email API built for SaaS platforms. Multi-tenant architecture, guided domain setup, and per-tenant analytics — all via API.

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