Best email marketing software for Agencies2026

Agencies have different priorities than single-brand email senders. They typically manage campaigns across several clients at once, which means seat limits, account separation, and automation flexibility all affect day-to-day operations in ways that matter more than they would for an in-house team.

Seat counts are worth checking carefully. ActiveCampaign's Starter plan allows only one user, with the Pro plan allowing three and Enterprise allowing five. MailerLite's Power plan stands out here by offering unlimited seats, which removes the per-user cost concern as an agency grows its team. The Comfort plan allows three seats. For agencies where multiple people need access simultaneously, that distinction can affect which tool makes financial sense.

Automation capability is another key consideration. ActiveCampaign's Starter plan limits automation to five actions, while Plus and higher plans remove that cap entirely. GetResponse's Starter plan includes only one automation workflow, while the Marketer plan opens up unlimited automation. Brevo includes marketing automation on its Business plan, but that plan's price is not publicly listed. Agencies that rely on complex, multi-step workflows for clients should confirm that the plan they are considering actually supports the automation depth they need.

Pricing transparency varies across these tools. Brevo's Business plan and ActiveCampaign's Plus, Pro, and Enterprise tiers all carry prices that are not publicly listed. GetResponse's Enterprise plan is also custom-priced. That means agencies comparing total costs across tools may find it easier to estimate budgets with MailerLite or GetResponse's Starter and Marketer tiers, where prices are clearly stated. Brevo's volume-based model — charging by emails sent rather than contacts stored — can work in an agency's favour when managing clients with large lists who send infrequently, but it can become harder to predict costs when send volumes are high across multiple accounts.

Integration support is relevant because agencies often connect email tools to client CRMs, e-commerce platforms, or reporting dashboards. ActiveCampaign lists over 1,000 integrations and includes a built-in CRM. Brevo also includes a CRM. MailerLite lists 100-plus integrations. GetResponse includes a website and landing page builder, which may reduce the number of third-party tools needed for certain clients. Agencies should map their existing client tech stacks against each tool's published integration list before deciding.