Best Email Marketing for Agencies in 2026 (7 Tools)

Best Email Marketing for Agencies in 2026 — verdict at a glance: ActiveCampaign for the strongest multi-client automation and account management, GetResponse MAX for true white-label and per-client billing, Brevo for the lowest-cost sub-account model, Mailchimp for its purpose-built agency program and partner tiers, MailerLite for clean multi-account onboarding of small clients, Klaviyo for ecommerce-only agencies, and Constant Contact for franchises that need hands-on client support. Below we rank all seven on client sub-accounts, user roles, white-label, and how each one bills.

Best email marketing for agencies: the short answer

The best email marketing for agencies in 2026 is the platform that lets you run dozens of client accounts from one login without re-learning a new tool for each brand. That means real client sub-accounts, granular user roles, white-label sending, and billing you can either absorb or pass through. An agency’s needs are not a small business’s needs scaled up — you are managing access, not just contacts. In this best email marketing for agencies guide we rank seven platforms on exactly those four axes. Pricing and feature tiers were cross-checked against EmailToolTester’s 2026 software comparison so the numbers reflect real 2026 plans.

How we ranked the best email marketing software for agencies

To shortlist the best email marketing software for agencies, each tool had to clear four agency-specific bars that consumer roundups ignore. First, client sub-accounts: can you isolate each client’s lists, templates, and reporting so nothing leaks between brands? Second, multi-user and roles: can you grant a junior copywriter draft access without handing over billing or the ability to delete a client’s audience? Third, white-label: can you remove the vendor’s branding from emails, login screens, and client dashboards so the work looks like yours?

Fourth, billing: does the platform let you consolidate invoices, mark up the cost, or hand clients their own card? Tools that nailed automation but forced you into one shared account ranked lower, because account isolation is the whole game in agency email marketing for agencies workflows.

At a glance: best email marketing for agencies comparison table

Tool	Client sub-accounts	White-label	Roles & permissions	Best for
ActiveCampaign	Yes (agency/multi-account)	Partial (client dashboards)	Granular, per-account	Multi-client automation
GetResponse MAX	Yes, unlimited workspaces	Full white-label	Role-based, SSO	True white-label + billing
Brevo	Yes (sub-organizations)	Partial	Team roles	Lowest-cost sub-accounts
Mailchimp	Yes (Agency program)	Limited	Account-level roles	Partner/referral program
MailerLite	Separate accounts	No	Basic roles	Small-client onboarding
Klaviyo	Yes (partner accounts)	Limited	Role-based	Ecommerce-only agencies
Constant Contact	Yes (Partner program)	Limited	Account roles	Franchise & local clients

1. ActiveCampaign — the strongest multi-client automation

ActiveCampaign is our first recommendation for the best email marketing for agencies because it pairs the deepest automation builder in the category with a genuine multi-account structure. Through its agency and reseller tiers you can spin up separate client accounts, each with isolated lists, automations, and reporting, and switch between them from one operator login. The workflow builder — nested branches, lead scoring, conditional content, split tests inside automations — means you can build a reusable nurture once and clone it across clients rather than rebuilding by hand.

Roles are granular: you can give a client read-only reporting access, hand a freelancer draft rights, and keep billing locked to the agency. White-labeling is partial — you can present client-facing dashboards and remove some branding, though it is not as fully unbranded as GetResponse MAX. Pricing scales by account and contact volume, so it ranks among the best email marketing for agencies whose clients each run real automation rather than the occasional newsletter. Read our full ActiveCampaign review for 2026 for the deeper inspection.

Choose ActiveCampaign if: you want the best email marketing for agencies whose clients need serious automation and a CRM, managing many accounts without rebuilding workflows for each one. If the per-account cost climbs, our best ActiveCampaign alternatives roundup shows cheaper routes.

2. GetResponse MAX — true white-label and per-client billing

GetResponse MAX is the purpose-built agency tier, and for the best email marketing for agencies it is the platform to beat on the two things agencies care about most: full white-label and flexible billing. With MAX you get unlimited workspaces (one per client), single sign-on, role-based team management, and dedicated IP addresses for deliverability you control per client. Crucially, you can remove GetResponse branding entirely — from emails, login pages, and the client-facing interface — so the whole stack reads as your agency’s own product.

Billing is where MAX pulls ahead: you can consolidate everything into one agency invoice and mark up the cost to clients, or structure per-client arrangements, which makes reselling the platform a genuine revenue line rather than a pass-through expense. It bundles the wider GetResponse toolkit too — landing pages, funnels, and webinars — so client deliverables go beyond email. Pricing is custom and quote-based, sitting above the self-serve tiers, but for an agency running 10-plus active clients the per-client economics work out. Our full GetResponse review covers the underlying platform, and our best GetResponse alternatives piece compares the field if MAX is over budget.

Choose GetResponse MAX if: white-label presentation and per-client billing are non-negotiable, and you want to resell email marketing as your own branded service.

3. Brevo — the lowest-cost sub-account model

Brevo (formerly Sendinblue) earns its place on any best email marketing for agencies list because its pay-per-send pricing is uniquely well-suited to agencies juggling many clients with large but infrequently mailed lists. Where per-contact tools punish you for every client’s dormant subscribers, Brevo bills on emails actually sent, so an agency managing a dozen 20,000-name lists that each mail twice a month pays a fraction of what a per-contact competitor would charge. That structural advantage compounds across a client book.

Brevo supports sub-organizations on its higher tiers, letting you separate client data and assign team roles, and it bundles a CRM, SMS, WhatsApp, and a transactional API so you can cover more of a client’s stack in one place. White-labeling is partial rather than complete, and the sub-account management is less polished than GetResponse MAX, but on raw cost-to-serve it is hard to beat. Read our full Brevo review for 2026 for the detail.

Choose Brevo if: you want the best email marketing for agencies whose clients have big lists they email infrequently, and the lowest credible cost-to-serve across a wide client portfolio.

4. Mailchimp — the purpose-built agency program

Mailchimp runs a dedicated Mailchimp & Co. partner program built specifically for agencies and freelancers, which is why it makes our best email marketing for agencies list despite per-contact pricing that climbs at scale. The program gives you a single dashboard to manage and switch between client accounts, pooled credits, partner discounts, certifications, and referral commissions for the clients you bring on. For an agency whose clients already know and trust the Mailchimp brand, that familiarity shortens onboarding considerably.

The trade-offs are real: white-labeling is limited, so the client always sees Mailchimp branding, and the per-contact model means a few large client lists can get expensive fast. Account-level roles let you control access, but the permission granularity is shallower than ActiveCampaign’s. It is the safe, well-supported default rather than the most powerful agency tool. Our Mailchimp review has the full breakdown of where it fits.

Choose Mailchimp if: you want a formal partner program with referral revenue and your clients value the familiar brand over white-label polish.

5. MailerLite — clean onboarding for small clients

MailerLite is the best email marketing for agencies when your clients are small businesses, solopreneurs, or local brands that need a good-looking newsletter rather than a complex funnel. Its drag-and-drop editor is the cleanest in the category, so handing a client a finished, on-brand template takes an afternoon, not a sprint. For agencies that churn through many small engagements, that low setup friction is worth real margin.

The honest limitation, weighing it as the best email marketing for agencies of a certain size: MailerLite does not offer a unified agency multi-account layer the way GetResponse MAX or ActiveCampaign do. You typically run a separate account per client, and there is no real white-label. Roles and permissions exist but are basic. For a boutique shop managing a handful of straightforward clients, though, the design quality and predictable pricing often outweigh the lack of a formal agency console. See our full best email marketing for small business guide for how it serves the clients you’d put on it.

Choose MailerLite if: you want the best email marketing for agencies whose clients are small, design matters more than automation depth, and you can live with one account per client.

6. Klaviyo — the ecommerce-only agency pick

Klaviyo is the specialist’s choice for the best email marketing for agencies that live entirely in Shopify and ecommerce, where nothing here matches its product-level data, predictive segmentation, and revenue attribution. Its partner program gives accredited agencies access to client accounts, a dedicated portal, co-marketing, and referral commissions, and the platform’s tight store integration means your campaigns can target browse and purchase behavior no general-purpose tool can see.

The reasons it is not the best email marketing for agencies in general are scope and cost. Klaviyo is overkill and overpriced for non-store clients, its per-profile billing climbs steeply as client lists grow, and white-labeling is limited. But for an ecommerce-focused shop it is genuinely the best tool, full stop. Our Klaviyo review covers whether the power justifies the price for your client mix.

Choose Klaviyo if: every client you serve sells online and you want the deepest ecommerce data and revenue reporting available.

7. Constant Contact — franchises and hands-on clients

Constant Contact rounds out our best email marketing for agencies list on a dimension the others skip: human support and a partner network built for franchises and local multi-location brands. Its partner program lets agencies and resellers manage multiple client accounts, earn commissions, and lean on genuine phone support and live onboarding — exactly what a non-technical client wants the night before a launch. The editor is simple, deliverability is battle-tested over three decades, and the event and survey tools suit local campaigns.

Automation is lighter than ActiveCampaign or GetResponse, white-labeling is limited, and at scale it is not the cheapest. But for an agency serving franchises, nonprofits, or local clients who value a phone call over a help doc, the support model and account structure earn their keep. Account-level roles cover the basics for handing clients controlled access.

Choose Constant Contact if: you serve franchises or local clients who need hands-on support more than deep automation or white-label branding.

Honourable mentions and what we excluded

A few tools we tested but didn’t rank. HubSpot has excellent multi-client management through its Solutions Partner program, but its all-in-one CRM pricing is far heavier than most email-focused agencies need. Omnisend mirrors Klaviyo’s ecommerce strength with a friendlier partner program, and it nearly took the sixth slot for store-only shops. Drip and Kit (formerly ConvertKit) are strong for ecommerce and creator clients respectively but lack a true agency multi-account console. For the automation skills that make any of these pay off across clients, our email automation guide and email deliverability guide are the two references we hand every new agency hire.

FAQ: best email marketing for agencies

What is the best email marketing for agencies overall?

For most agencies the best email marketing for agencies in 2026 is ActiveCampaign, because it combines deep multi-client automation with isolated client accounts and granular roles. If full white-label and per-client billing matter more than automation depth, GetResponse MAX is the better choice, since it lets you resell the platform entirely under your own brand.

Which platform has the best white-label for agencies?

For white-label, the best email marketing for agencies is GetResponse MAX: it offers the most complete white-label of the seven, so you can strip vendor branding from emails, login pages, and client dashboards, and present the platform as your agency’s own. ActiveCampaign, Mailchimp, Klaviyo, and Constant Contact offer partial or client-facing branding controls but stop short of full white-label.

How does client sub-account billing usually work?

It depends on the platform. GetResponse MAX and Brevo let an agency hold one consolidated invoice and mark up the cost to clients, so email becomes a revenue line. Mailchimp, Klaviyo, and Constant Contact partner programs typically pay referral commissions or partner discounts instead, while letting each client keep their own billing. Decide upfront whether you want to resell the seat or simply manage it.

Do these tools support multi-user roles and permissions?

Yes, and for role depth the best email marketing for agencies is ActiveCampaign or GetResponse MAX, which offer the most granular role-based access — separate rights for billing, editing, and reporting per account, with SSO on MAX. Brevo, Klaviyo, Mailchimp, and Constant Contact provide account-level roles that cover the essentials, while MailerLite’s permissions are the most basic. If you have freelancers who need limited draft access, check the role granularity before committing.

What is the cheapest email marketing software for agencies?

On cost-to-serve, the cheapest of the best email marketing for agencies is usually Brevo, because it bills on emails sent rather than contacts stored — ideal for agencies managing large lists that mail infrequently. MailerLite is the cheapest for small-client portfolios, while GetResponse MAX costs more upfront but can become net-positive once you mark it up and resell it.

Should an ecommerce agency use a different tool?

Often, yes. The best email marketing for agencies serving only online stores is Klaviyo (or Omnisend), which gives you product-level data, predictive segmentation, and revenue attribution that general-purpose platforms can’t match. For mixed client books that include non-store brands, a broader tool like ActiveCampaign or GetResponse MAX is the safer single bet.

Our verdict on the best email marketing for agencies

If we had to name one default from the best email marketing for agencies above, it is ActiveCampaign — it gives you isolated client accounts, the deepest reusable automation, and roles granular enough to bring freelancers in safely. The best email marketing for agencies choice flips to GetResponse MAX the moment white-label presentation and per-client billing become the priority, since it lets you resell the whole stack under your own brand. Brevo wins on raw cost-to-serve for large infrequently-mailed lists, Mailchimp for its formal partner program, and Klaviyo for ecommerce-only shops. Start a trial with the one that matches how you bill clients, onboard a single account, and only scale your client book once the workflow feels native.

Start with our top agency picks:

Want a deeper read on individual tools? See our ActiveCampaign Review 2026 or our GetResponse review to compare the top two in detail.

Make your emails actually land

Whichever tool you choose from this list, deliverability is what decides whether your emails land — set these foundations next:

• Free Email Health Check — score your sending domain out of 100 in 30 seconds — the fastest way to see what to fix.
• Email deliverability hub — reputation, warm-up, blacklists and inbox placement.
• Gmail, Yahoo & Microsoft sender requirements — the rules bulk senders must now meet to be delivered.
• Email authentication (SPF, DKIM & DMARC) — prove your mail is really yours and stop spoofing.

Related reading

• Best Mailchimp Alternatives
• Best Email Marketing for Shopify
• Best Free Email Marketing Tools
• Best Email Marketing for Creators
• Best Email Marketing for Nonprofits

Affiliate disclosure: ToolTrusted may earn a commission from links above at no extra cost to you. See our disclosure page. Rankings reflect our independent editorial verdict.