Best Email Marketing Software for Agencies
Five platforms tested through an agency lens: multi-client management, white-label, and resale margin.
If you run an agency juggling several client brands from one login, pick Campaign Monitor. If you sell automation build-outs as a service, pick ActiveCampaign; if you want the lowest cost across many small client lists, pick Brevo.
Some links are affiliate links, and it never affects our scores.
All 5 agency email tools compared
Here is the 2026 agency ranking at a glance, scored from our hands-on test with pricing checked in 2026. Tap any tool to jump to its full breakdown.
| Best for | Free plan | Team size | Visit | ||||
|---|---|---|---|---|---|---|---|
| 3 | Brevo | Best value for boutique agencies | 4.2/5 | Free plan, paid from $9/mo | ✓ | Boutique agencies | Visit → |
| 2 | ActiveCampaign | Best for automation-focused agencies | 4.0/5 | From $15/mo (annual) | — | Automation agencies | Visit → |
| 5 | Sender | Best for agency client onboarding | 4.0/5 | Free plan, paid from $7/mo | ✓ | Startup agencies | Visit → |
| 1 | Campaign Monitor | Best for multi-client agencies | 3.6/5 | From $13/mo (500 contacts) | — | Multi-brand agencies | Visit → |
| 4 | Moosend | Best budget pick for solo consultants | 3.5/5 | From $9/mo (500 contacts) | — | Solo consultants | Visit → |
Scores from our hands-on reviews, re-ranked for agency workflows. Pricing checked 2026.
How we tested & scored for agencies
We do not rank email tools from a feature page. Every platform here was set up with real lists, real automations and real sends, then scored against the same five criteria and re-ranked for how agencies actually work. The agency lens matters: a tool can score well overall and still fail an agency if it cannot isolate client data, lock branded templates, or keep resale margin intact across many small lists. So we weighted multi-client management, white-label options and per-client reporting heavily inside the features score. You get a single score out of five per platform plus a full breakdown, so you can weigh client management against automation depth and price for your own book of clients. Affiliate links help fund the testing, but they never move a score.
- Features & depthMulti-client sub-accounts, white-label, brand-locked templates, per-client reporting, automation logic and how far the tool scales across many clients.25%
- Ease of useHow fast your team and your clients build a first campaign: editor, onboarding, account switching and the learning curve.20%
- Value for moneyResale margin per dollar, including free tiers, billing model and how fast costs climb as you add client lists.20%
- IntegrationsNative connectors for client ecommerce, CMS and CRM stacks, plus API depth and reach via Zapier and webhooks.20%
- Customer supportResponse times when a client send breaks on deadline, channels, documentation quality and reliability under pressure.15%
Affiliate links never affect scoring.
Campaign Monitor
Campaign Monitor tops the agency ranking because it is the only tool here built for the job. Its client management tier creates isolated client accounts under one master login, with brand-locked templates and separate sending domains per client, so you switch between clients without ever mixing lists or data. Ease of use scores 4.3 thanks to a premium drag-and-drop builder that produces emails clients are happy to pay for, which makes design a tangible retainer deliverable. The honest downside for agencies: value scores just 2.6 because the Premier tier runs $171/mo for only 500 contacts, and there is no SMS, no CRM, and lighter automation than ActiveCampaign. If your agency bills for multi-brand management and design polish, that price can still pencil out.
- Isolated client accounts under one master login
- Brand-locked templates and sending domains per client
- Premium builder that justifies agency design fees
- Time-zone sending and dynamic content per campaign
- ✓Best multi-client brand management in the ranking
- ✓Premium email builder impresses clients and justifies agency fees
- ✓Time-zone sending and dynamic content for sophisticated campaigns
- ✗Expensive at Premier tier relative to contact limits
- ✗No SMS, no CRM, lighter automation vs ActiveCampaign
The agency standard: if you run multiple client brands and bill for design quality, nothing else here isolates clients this cleanly.
ActiveCampaign
ActiveCampaign is the pick for agencies that charge for automation as a service. Its 900+ pre-built recipes mean a client's welcome series, lead-nurture and re-engagement flows each start from a template and get customized in minutes, which is why features score a category-leading 4.5. The built-in CRM on higher plans lets you track a client's sales pipeline alongside the email work, so an automation agency can bill for the whole funnel. The honest downside for agencies: there is no native white-label or multi-client sub-account, so each client typically needs a separate account and the management overhead that comes with it. The learning curve is steep and real cost climbs fast once you add CRM, SMS or custom reporting. For agencies that sell the depth, it earns its place.
- 900+ automation recipes to deploy for clients fast
- Built-in CRM for client pipeline management
- Huge integration library to connect client stacks
- Predictive sending and behavioral segmentation
- ✓Deepest automation : ideal for agencies billing for automation build-outs
- ✓Huge integration library (900+) for connecting client martech stacks
- ✓Strong built-in CRM for agencies with a sales component
- ✗No built-in multi-client sub-account; separate account per client needed
- ✗Steep learning curve and real cost climbs fast with add-ons
The automation seller's pick: if your agency builds and bills for complex flows, nothing here goes deeper.
Brevo
Brevo is the value pick for boutique agencies, and its 4.5 scores for ease of use and value show why. It bills by emails sent rather than per contact, so aggregating five or ten small client lists does not inflate the bill : only actual send volume drives cost, which protects resale margin when client lists sit idle between campaigns. Email, SMS, WhatsApp and a free CRM all sit in one invoice, easy to bundle into a client retainer. The honest downside for agencies: there is no dedicated multi-client portal without Brevo's Agency reseller tier, and automation depth trails ActiveCampaign for complex client workflows. For an agency that wants to keep tooling cheap and billing simple, it is the smart-margin choice.
- Pay-per-send billing protects resale margin
- Email, SMS, WhatsApp and CRM in one invoice
- Generous free plan to start client work
- Free CRM bundled at no extra charge
- ✓Best value per feature : easy to bundle into client retainers
- ✓Email + SMS + WhatsApp + CRM in one invoice
- ✓Pay-per-send pricing suits aggregate low-frequency client lists
- ✗No dedicated multi-client portal without the Agency reseller tier
- ✗Automation depth trails ActiveCampaign for complex flows
The margin-friendly pick: if you run several small client lists and want billing to stay simple, Brevo keeps costs linear.
Moosend
Moosend is the cheapest entry point for a solo consultant handling a handful of small clients. Every plan includes unlimited sends from $9/mo for 500 contacts, so your resale margin stays predictable, and a 30-day full-access trial makes it easy to demo a campaign to a client before anyone commits a card. Ease of use at 4.3 means you can hand off access to a non-technical client without much hand-holding. The honest downside for agencies: support scores a weak 2.6, which is a real risk when a client send breaks the day before a launch, and there is no multi-client account portal so you manage each client manually. For a one-person shop watching every euro, the price still wins.
- Unlimited sends on every plan for predictable margin
- Cheapest automation in the ranking from $9/mo
- 30-day full-access trial to demo to clients
- Easy enough to hand off to non-technical clients
- ✓Unlimited sends on all plans : predictable resale margin
- ✓Easy enough for non-technical clients if you hand off access
- ✓Cheapest automation in the ranking from $9/mo
- ✗Weak support (2.6) : a problem when client deadlines are at stake
- ✗Fewer integrations than Brevo or ActiveCampaign
The solo budget pick: cheap unlimited sends for a small client roster, as long as you can live with thin support.
Sender
Sender is the onboarding tool for a young agency. Its free plan covers 2,500 contacts with full automation, so you can spin up a new client's first campaign, prove open rates and automation sequences, then fold the paid cost into the retainer once value is shown. It backs that with the best support score in the ranking at 4.6 : when a client send goes wrong, Sender's team responds fastest, which matters when your reputation is on the line. The honest downside for agencies: integrations score just 3.2, so it struggles to fit a complex client martech stack, and free-plan emails carry Sender branding, which looks unprofessional in front of a client. As a prove-value starting point, nothing here is cheaper or better supported.
- Free plan for 2,500 contacts with full automation
- Best support score in the ranking (4.6)
- Paid plans from $7/mo for low-budget retainers
- Fast emergency response for client campaign issues
- ✓Best support score : reliable emergency response for client campaign issues
- ✓Free plan for 2,500 contacts proves value before invoicing
- ✓Paid plans from $7/mo easy to include in low-budget retainers
- ✗Smaller integration library : hard to fit into complex client stacks
- ✗Sender branding on free plan is unprofessional for agency use
The onboarding champion: prove email value to a new client at near-zero cost, then upgrade once the retainer is signed.
How to choose agency email software in 2026
The best agency email tool is the one that fits how you manage clients and protect margin, not the one with the longest feature list. Start from your client count and how you bill, then match it to the right pick below.
Solo email consultant (1-3 clients)
Boutique design-focused agency (4-10 clients)
Automation agency (selling workflow builds)
Startup agency (first clients, zero tool budget)
- Count your clients and decide if you need native multi-client sub-accounts or can run separate logins.
- Check whether you can white-label or brand-lock templates per client to protect your agency presentation.
- Confirm the billing model protects resale margin: pay-per-send vs per-contact across many client lists.
- Verify per-client reporting dashboards exist for monthly retainer reviews.
- Test support response speed, since a broken client send on deadline is a reputational risk.
- Match automation depth to whether you sell workflow build-outs or just send campaigns.
- Confirm native integrations with your clients' ecommerce, CMS and CRM stacks before you commit.
Best Email Marketing Software for Agencies 2026 · FAQ
What is the best email marketing software for agencies in 2026?
Campaign Monitor is the best email marketing tool for agencies that manage multiple clients in 2026. It is the only platform in our ranking with dedicated multi-client account management, brand-locked templates per client, and isolated sending domains, all from one master login. For agencies that sell automation as a service, ActiveCampaign is the stronger pick with 900+ automation recipes and a built-in CRM. We tested all five hands-on across the same five criteria and re-ranked them specifically for agency workflows.Which email marketing tool supports multiple clients from one account?
Campaign Monitor is the only tool in our ranking with native multi-client management, letting agencies create and report on separate client brands from one master account. Each client gets an isolated account, brand-locked templates and a separate sending domain. Brevo and ActiveCampaign require separate accounts per client or a dedicated reseller agreement, which adds management overhead at scale. If multi-client management is your priority, Campaign Monitor is the clear pick.What is the cheapest email marketing software for agencies?
Sender is the cheapest starting point with a free plan for 2,500 contacts and paid plans from $7/mo. Brevo is often cheapest at scale for agencies with large aggregate client lists because it bills by emails sent, not by contact count, which protects margin when lists mail infrequently. Moosend at $9/mo with unlimited sends is also competitive for cost-focused agencies. Match the choice to whether you are starting out or scaling many client lists.Is ActiveCampaign good for marketing agencies?
ActiveCampaign is excellent for agencies that sell email automation as a service. Its 900+ pre-built automation recipes let agencies build sophisticated client workflows quickly, and the built-in CRM helps manage client pipelines alongside the email work. The honest downside for agencies is that it has no native multi-client sub-account structure, so each client typically requires a separate account. Plan for that management overhead if you run many clients.Can agencies white-label email marketing software?
Brevo offers a white-label reseller program for agencies wanting to present the platform under their own brand. Campaign Monitor's agency tier provides isolated client accounts and custom branding per client, though not full white-labeling of the platform itself. ActiveCampaign does not have a built-in white-label option, so agencies that need it should look at Brevo's reseller tier or Campaign Monitor's client management.Campaign Monitor vs ActiveCampaign for agencies: which is better?
Choose Campaign Monitor if your agency sells design-quality email and needs to manage multiple client brands from one dashboard with isolated accounts. Choose ActiveCampaign if your agency sells email automation as a deliverable, since it has the deepest automation logic, a CRM, and the largest integration library. Both cost more than Brevo or Sender. The decision comes down to whether your clients buy design polish or complex workflows.What is the best free email marketing tool for agencies?
Sender has the most useful free plan for agencies: 2,500 contacts and 15,000 emails a month with full automation, useful for onboarding first clients at zero cost. Brevo's free plan offers unlimited contacts and 300 emails a day plus a free CRM. Neither supports serious multi-client management at scale, but both work as a prove-value starting point before you move a client onto a paid retainer plan.How do agencies manage email marketing for multiple clients?
The cleanest approach is Campaign Monitor's client management tier, which gives each client an isolated account with locked templates, a separate sending domain, and individual reporting. Agencies using Brevo or ActiveCampaign typically create separate accounts per client, billing them individually or aggregating costs under a reseller agreement. The right method depends on how many clients you run and whether you need per-client data isolation for compliance or reporting.Is Brevo good for agencies?
Brevo is a strong choice for boutique agencies on a budget. Its pay-per-send billing keeps aggregate costs low when managing multiple small client lists that mail infrequently, which protects resale margin. It bundles email, SMS and WhatsApp in one platform with a free CRM. The limitation is no native multi-client management portal, so agencies need separate logins or the Agency reseller program. For margin-conscious boutique work, it is the best value here.What email marketing features matter most for agencies?
Top features agencies need: multi-client sub-account management to keep client data isolated, white-label or custom branding options, client-level reporting dashboards for retainer reviews, a strong template builder to justify design fees, and reliable support for time-sensitive client sends. Automation depth matters most for agencies billing for workflow build-outs. Weigh these against your billing model, since pay-per-send pricing protects margin across many small client lists.
