What's the best email marketing software for agencies in 2026?
For an agency, the deciding question isn't features. It's who owns the client's account: you or them.
You're juggling newsletters for six clients across six logins, six invoices and six dashboards. Or you crammed everyone into one account, and when a client leaves, their contacts are tangled with everyone else's. Agency-ready email platforms fix this with sub-accounts: one workspace per client, each with its own lists, sending domains and reputation, all run from a parent account.
We compared seven platforms on what actually matters to an agency: sub-accounts, white label (the app under your logo and domain), how the client gets billed, and where your margin comes from. Short answer: ActiveCampaign if you resell automation to several clients, Mailjet for 20 sub-accounts on one $29 invoice, MailerLite if each client keeps their own account and bill, Campaign Monitor if you want a fully branded product.
This ranking is editorial: a sponsored spot is always labeled on its entry, and no affiliate link changes a score.
The best email platform for your kind of agency
25% to 55% off every resold account
Big lists, few sendsBilled per email, not per contact
Client owns the accountSwitch client accounts in two clicks
One invoice for everyone20 sub-accounts from $29/mo
A product under your brandLogo, colors, domain, built-in markup
White label on a budgetSub-accounts, your domain and logo
7 email platforms for agencies, side by side
This ranking is for a web, marketing or creative agency handling email for 3 to 30 clients. The "Agency feature" column says what each platform really offers for multi-client work, based on its official pages. Prices are the US list prices, before tax.
| Best for | Agency feature | Free plan | Team size | Visit | ||||
|---|---|---|---|---|---|---|---|---|
| 1 | ActiveCampaign | Best for reselling | Agency program: discount, rebranding, resold accounts | 4.2/5 | $15/mo (yearly, 1,000 contacts) | — | Agencies selling automation | Visit → |
| 2 | Brevo | Cheapest for big lists | Sub-organizations on Enterprise | 4.1/5 | Free, then $9/mo | ✓ | Clients with large, quiet lists | Visit → |
| 3 | MailerLite | Best when the client pays | Separate client accounts, 30% commission | 4.1/5 | Free, then $12/mo per account | ✓ | Small agencies and freelancers | Visit → |
| 4 | Mailchimp | When the client is already there | Multi-client access, Mailchimp & Co | 4.0/5 | Free, then $13/mo | ✓ | Agencies inheriting accounts | Visit → |
| 5 | Mailjet | Most sub-accounts for the money | 20 sub-accounts, single invoice | 3.8/5 | Free, then $9/mo; Premium $29 | ✓ | 5 to 20 small clients | Visit → |
| 6 | Campaign Monitor | Most complete white label | Sub-accounts, white label, billed markup | 3.6/5 | $11/mo (500 contacts) | — | Agencies reselling under their name | Visit → |
| 7 | Moosend | White label on a budget | Sub-accounts, domain, logo, markup | 3.5/5 | $9/mo (500 contacts) | — | Small agencies, tight budgets | Visit → |
Scores on five criteria, the same as in our full reviews and other rankings. Entry prices checked in 2026 on official pricing pages, before tax.
Is your tool missing from this page? Email us: hello@hackceleration.com
How we compared and scored
This page is for agencies that send email on behalf of their clients: newsletters, nurture flows, welcome sequences. Cold outreach is a different job with different tools, so it's out of scope.
For each vendor we started with its agency page and its pricing grid. A platform only made the ranking if its price is readable and its multi-client feature is described on an official page. Then we read agency feedback, worst first: shared sending quotas, deleted parent accounts, billing disputes. Acumbamail, Zoho Campaigns and Elastic Email all have agency offers, but we couldn't read a clear price for the plan that unlocks them, so they stay out.
Scores come from our full reviews and other rankings, so a tool carries the same score everywhere on the site. Rank follows score. For an agency, though, read the "Agency feature" column first: a higher-scored tool without sub-accounts can be the wrong pick for your model.
- Ease of useEmail builder, switching between clients, client onboarding.20%
- Value for moneyCost for 5 and 10 clients, billing unit, agency discount.25%
- FeaturesSub-accounts, white label, rebilling, automation.25%
- SupportWho answers your client, which plans, agency feedback.15%
- IntegrationsYour clients' CMS, CRM, store and automation tools.15%
This ranking is editorial: a sponsored spot is always labeled on its entry, and no affiliate link changes a score.
Agency programs change often. Get the updates
ActiveCampaign
ActiveCampaign runs the most structured agency program in this ranking. Every client gets their own account, which you resell. ActiveCampaign bills you monthly for each active resold account, with a discount that scales with volume: 25% for 2 to 24 accounts, 35% for 25 to 49, 45% for 50 to 99 and 55% from 100. With only one account, you pay list price.
The catch is in the reseller agreement. You, not ActiveCampaign, collect from the client, handle upgrades and process cancellations, which makes you first-line support. If you'd rather not carry that, there's a commission track where ActiveCampaign bills the client directly. As a product, it has the deepest automation here: branching flows, lead scoring (points that climb when a prospect opens, clicks or visits) and 900+ integrations.
- 25% to 55% off every resold account
- Resold accounts can carry your branding
- Advanced flows and lead scoring
- ✓Strongest reseller discount, from your second client
- ✓One separate account per client, nothing mixed
- ✓Choose between reselling and commission
- ✗You own billing, upgrades and cancellations
- ✗Per-contact pricing squeezes margin on big lists
- ✗No free plan for tiny clients
The pick for agencies that sell automation. Run your numbers on Plus at $49: with the 25% discount, each account costs you $36.75 a month before your markup.
Brevo
Brevo (formerly Sendinblue) charges per email sent, not per contact. For an agency that's the whole point: a client with 20,000 contacts who emails once a month costs far less here than on a per-contact platform. The free plan sends 300 emails a day, and Starter begins at $9 a month for 5,000 emails.
The limit is clear-cut. Real multi-client management, sub-organizations, lives on the Enterprise plan, priced on quote. Each sub-account there gets its own IP address and API key. Below that, you open one account per client and get invited in. Brevo runs an agency partner program with centralized account management and commission on clients you bring. We found no white label on its official pages.
- Pay per email sent
- Email, SMS, WhatsApp and transactional
- Agency partner program
- ✓Cheapest for big, low-frequency lists
- ✓Transactional email in the same account
- ✓Generous free plan for small clients
- ✗Sub-organizations only on Enterprise
- ✗No documented white label
- ✗Brevo logo in emails on Starter unless you pay to remove it
A smart pick if each client keeps their own account and has a big list. For a true multi-client dashboard, you'll be negotiating Enterprise.
MailerLite
MailerLite keeps it simple. Each client has their own account, subscribers, templates and invoice, and you hop between client accounts in two clicks from your own login. The client owns their data and their billing relationship. If they leave, they take everything, and you never chase an unpaid invoice.
MailerLite says it plainly: there's no white-label or reseller version. You earn through the affiliate program instead, 30% of each referred client's spend for as long as they stay. On a client paying $12 a month, that's about $3.60, so treat it as a bonus, not a business model. The Power plan, from $25, includes unlimited seats, handy when your team and the client's team share an account.
- Switch client accounts in two clicks
- 30% recurring commission per client
- Simplest interface in the ranking
- ✓Client keeps data and invoice
- ✓No billing or collections to carry
- ✓Free up to 250 subscribers for tiny clients
- ✗No white label, no reselling
- ✗One invoice per client, no consolidated view
- ✗Strict account approval at signup
The most comfortable model if you bill for your time, not the software. If you want margin on the subscription, look at ActiveCampaign or Campaign Monitor.
Mailchimp
Mailchimp has no sub-accounts. Each client keeps their own account and invites you in as a user. Its agency program, Mailchimp & Co, is free to join and adds tools for managing multiple clients, a commission with no published rate, and a partner manager at the Pro tier. No white label, no consolidated billing.
It stays in an agency ranking for a practical reason: a lot of clients already live there, with years of history, signup forms and store or CRM integrations. Moving them often costs more than working inside. Watch the bill, though. Mailchimp charges for contacts in the audience, and the advertised prices are often first-year promos.
- Free Mailchimp & Co program
- Huge integration catalog
- Polished templates and builder
- ✓No migration for existing clients
- ✓One login to reach many client accounts
- ✓The name clients already know
- ✗No sub-accounts, no white label
- ✗Separate invoice per client
- ✗Per-contact pricing climbs fast
Keep it when the client is already on it and pays directly. Don't pitch it to a new client if you want ten accounts on one dashboard.
Mailjet
Mailjet is the cheapest route to real sub-accounts. Premium, at $29 a month for 15,000 emails, includes up to 20 of them, and the Custom plan has no cap. Each sub-account isolates a client's lists, data and sender reputation, and they all roll up into a single invoice on your main account. Mailjet's support opens sub-accounts on request at no extra cost.
The trap is the quota. Every sub-account draws on the same subscription. Agencies report that when one client blows past the volume, the overage hits everyone, and they've long been asking Mailjet for email packs per sub-account. There's also a reseller program with white or grey label and volume discounts, under contract and without public pricing.
- 20 sub-accounts on Premium
- One invoice for every client
- Sender reputation isolated per client
- ✓Lowest price per client in the ranking
- ✓Billed per email sent, like Brevo
- ✓Strong API and SMTP for client sites
- ✗Sending quota shared across clients
- ✗Only one sub-account on Starter and Essential
- ✗Parent account can't set rules for sub-accounts
Best price per client when clients send lightly. Check the quota every month, and move your heavy sender to its own account.
Campaign Monitor
On pure agency features, Campaign Monitor is the most complete. You create a separate account per client under your admin account, each with its own lists, campaigns, reports and API key. You can strip all Campaign Monitor branding and swap in your logo, colors and domain. Best of all, the platform bills your clients itself: set a rate per client, add your markup on top of the base price, and charge in their local currency.
So why sixth? Its value-for-money score is the weakest here (2.6 out of 5), and user reviews are rough on billing and support. One agency describes a parent account deleted for inactivity, with no warning, taking a client's list with it. The 10% annual discount doesn't apply to agency plans either.
- Full white label: logo, colors, domain
- Markup added and billed to clients by the platform
- Local-currency client billing
- ✓Only tool that bills your client at your markup
- ✓A real product under your name
- ✓Very easy builder for clients
- ✗Weak value for money
- ✗Annual discount excluded on agency plans
- ✗Billing disputes and support complaints
The best tool for white-label reselling, despite its score. Export every client list monthly so no contact base depends on a single account.
Moosend
Moosend's agency page ticks the three boxes: sub-accounts you manage on your clients' behalf, your own custom domain and logo, and a markup you set yourself. The Pro plan starts at $9 a month for 500 contacts, with 20% off yearly. That's the lowest entry plan among the white-label tools here, but the price of sub-accounts isn't published.
Support is the weak spot, scored 2.6 out of 5, and that's a real risk when you're the one answering clients. Integrations are also thinner than ActiveCampaign's or Mailchimp's. Get the sub-account price in writing before you package your offer.
- Sub-accounts run for your clients
- Your domain and logo
- Agency-set markup
- ✓Entry plan at $9 a month
- ✓Easy builder, 4.3 on ease of use
- ✓20% off yearly
- ✗Weakest support in the ranking
- ✗No published agency pricing
- ✗Limited integrations
A decent start for an agency with a handful of clients that wants its own logo. Confirm sub-account pricing in writing first.
What email costs for 5 or 10 clients
The headline price means little to an agency. What matters is who pays, what the platform counts (contacts or sends), and whether clients share a quota. Here are three models, worked out from official pricing.
You resell with a markup
At ActiveCampaign, five clients on Plus ($49 a month, billed yearly) cost you $36.75 each after the 25% discount: $183.75 a month. Anything you charge above that is margin, but unpaid invoices are yours. At Campaign Monitor, five clients on Lite cost at least $55 a month, and the platform bills them your markup.
You run everyone on one subscription
Mailjet Premium at $29 a month covers 15,000 emails and 20 sub-accounts. Five clients with 2,500 contacts each, emailing once a month, send 12,500 emails: it all fits, at $5.80 per client. Ten clients of that size break the quota, so you'll need a higher tier or must move the big senders out.
Each client pays for their own account
At MailerLite, five clients on Comfort pay at least $12 each, $60 in total, and you collect 30% as commission. At Brevo, five Starter accounts run $45 a month in total, 5,000 emails each. Your margin sits in your retainer, not the software.
- Who collects from the client: you or the vendor?
- Do sub-accounts share one sending quota?
- How many sub-accounts does the plan include?
- Does the white label cover the unsubscribe page too?
- Can the client take their contacts if you close your account?
- Does the agency discount start with your second client?
Run client email without nasty surprises
Agencies rarely switch platforms over a missing feature. They switch after losing a client list, blowing a shared quota or fighting a disputed invoice. Here's how to avoid all three.
Settle who owns the account before you sign
Put in your contract who owns the contact list and what happens when the client leaves. On MailerLite or Mailchimp, the client owns the account. On a resold sub-account, you do, so plan the export and handover.
- Where
- Your client contract
Authenticate every client's domain
Each client sends from their own domain, with SPF, DKIM and DMARC set up (three DNS records that prove to inbox providers the mail really comes from them). Never send two clients from the same domain: one client's spam complaints drag down the other's deliverability.
- Time
- About 20 minutes per client
- Where
- Client's DNS settings
Check the shared quota every month
On Mailjet, every sub-account draws on the same subscription. Look at volume per client at the start of each month, and move any client who out-sends the others combined into their own account.
Export client lists every month
A parent account that's closed, suspended or deleted for inactivity can take every sub-account down with it. A monthly CSV export of each list, stored on your side, protects you from an incident neither you nor the client controls.
Make CAN-SPAM your client's checklist too
Under CAN-SPAM, every commercial email needs a valid physical postal address and a working opt-out, and opt-outs must be honored within 10 business days. Both the client and the agency that sends for them can be held responsible, so bake these into every client template.
Check the unsubscribe page before selling "your brand"
On many platforms the vendor's logo stays on the unsubscribe page or in the email footer, even with white label switched on. Send yourself a test campaign, unsubscribe, and see exactly what your client's audience will see.
Where to go next
These pages pick up where this one stops, depending on your client.
Your questions about email for agencies
Which email marketing platform lets me manage multiple clients from one account?
Mailjet, Campaign Monitor, Moosend and Brevo (on Enterprise) offer real sub-accounts run from a parent account. Mailjet is the cheapest: 20 sub-accounts on Premium at $29 a month. MailerLite and Mailchimp let you jump between client accounts, but each one stays separate and is billed on its own.
Can I white-label email marketing software and sell it as my own?
Yes, with Campaign Monitor, Moosend, ActiveCampaign (agency program) and Mailjet (reseller contract). Campaign Monitor goes furthest: your logo, colors and domain, plus the platform billing clients for you. MailerLite explicitly offers no white label and no reselling.
How should an agency charge clients for email marketing?
Three common ways. Resell the subscription at a markup (ActiveCampaign, Campaign Monitor), fold the software into a monthly retainer, or let the client pay their own account and bill for your time (MailerLite, Mailchimp). The last is simplest: no collections risk, plus affiliate commission on top.
Who owns the email list when a client leaves the agency?
The client does, whatever the platform: it's their audience and their consent records. Handover is easy when the client owns the account (MailerLite, Mailchimp). With a resold sub-account, write a full CSV export and a delivery deadline into your contract.
Does Mailchimp have sub-accounts for agencies?
No. Each client keeps their own Mailchimp account and invites you as a user. The Mailchimp & Co program adds multi-client tools and commission, but no sub-accounts, no white label and no consolidated invoice.
Do clients in one agency account share deliverability?
Not if each client has their own sub-account and authenticated domain. Mailjet isolates sender reputation per sub-account, and Brevo gives each sub-organization its own IP address. The risk comes from clients sending from another client's domain, or a shared IP on a small plan.
What's the cheapest email platform for an agency with 10 clients?
It depends on how much they send. If they send lightly, Mailjet Premium at $29 a month with 20 sub-accounts is hard to beat while the total stays under 15,000 emails. If each client pays their own way, Brevo's free plan (300 emails a day) and MailerLite's (250 subscribers) cover the smallest ones.
Is an ActiveCampaign agency account more expensive than a regular one?
No, it's cheaper from your second client. With one resold account you pay list price. Once a second account is active, the 25% discount kicks in from the next billing cycle, rising to 35% at 25 accounts and up to 55% past 100.