POSTMASTER+ INTEGRATIONS
One email agent.
Your email platforms.
Bring campaign and subscriber context together with Postmaster+ email intelligence. We’re building beyond our first ESP connection, with a roadmap for marketing automation, newsletters, and ecommerce email teams.
Discuss your email platformFirst connection. Next platforms.
OptiPub is our first ESP integration. ActiveCampaign, beehiiv, and Klaviyo are planned additions—not live Postmaster+ connections. Ask about current workflow availability in a demo.
OptiPub
Publishing & email operations
Our first ESP connection brings campaign reporting, subscriber segments, and email operations context to Postmaster+.
Discuss your workflowsActiveCampaign
Marketing automation
Campaign performance, contacts, segments, and automations—a natural next step for email teams managing complex customer journeys.
Explore ActiveCampaignbeehiiv
Newsletters & publishing
Publication content, subscriber insights, and newsletter performance for publishers and newsletter-led businesses.
Explore beehiivKlaviyo
Ecommerce & lifecycle
Campaign and flow performance, customer context, and ecommerce email operations backed by Postmaster+ intelligence.
Explore KlaviyoThe wider ESP landscape
These platforms publish first-party account-access MCP documentation and are under consideration. Vendor capabilities are not a commitment to a Postmaster+ integration, release date, or complete agent workflow.
MailerLite
Newsletters & small teams
Subscribers, campaigns, groups, and automation context.
Vendor MCP documentationKit
Creators & newsletters
Subscribers, tags, segments, sequences, and broadcasts; paid-plan tool access.
Vendor MCP documentationCustomer.io
Lifecycle marketing
Workspace data, segments, automations, and one-time sends.
Vendor MCP documentationBrevo
Marketing & transactional
Campaigns, reporting, contacts, templates, and transactional email.
Vendor MCP documentationOmnisend
Ecommerce marketing
Campaign performance, campaign operations, and audience segments.
Vendor MCP documentationDrip
Ecommerce & automation
Subscribers, campaign reporting, workflows, and campaign preparation.
Vendor MCP documentationIterable
Enterprise lifecycle
Official self-hosted beta MCP; read-only defaults and configurable elevated access.
Vendor MCP documentationBraze
Enterprise engagement
Campaign/Canvas analytics and content tools; user-profile PII tools are excluded.
Vendor MCP documentationAWeber
Email marketing
Subscriber and list management, broadcasts, and reporting.
Vendor MCP documentationGetResponse
Email marketing
Newsletter results, contacts, and draft creation; no MCP sending or publishing.
Vendor MCP documentationSender
Email marketing
Subscribers, segments, reporting, and drafts; campaigns cannot be sent through MCP.
Vendor MCP documentationVendor documentation reviewed November 10, 2026. Plans, permissions, tools, and availability may change; authenticated connections have not been tested here.
ESP context and operations
ESPs supply campaign reporting, subscriber context, and the tools their platforms authorize. Each connection needs its own capability validation before Postmaster+ can describe a workflow as supported.
Postmaster+ intelligence
Verification, 0–10 engagement scores, DNS and sender compliance, and deep redirect-chain blocklist scans provide a separate intelligence layer. Gmail Postmaster Tools and Outlook SNDS are sending intelligence sources—not ESPs.
What about Mailchimp and transactional email?
Mailchimp’s Marketing documentation MCP searches documentation, not account data; its Transactional MCP is a separate offering. Resend and Postmark have operational MCPs but serve a different, transactional-email use case. We’re not listing these as planned marketing ESP integrations.
Explore Postmaster+ MCP and APIs