Postmark: pricing, API and MCP for AI agents
by Postmark (ActiveCampaign) · postmarkapp.com
Checked 2026-10-17 on Postmark (ActiveCampaign)'s own pages. Anything we could not confirm says “not verified”.
What is Postmark? Transactional email service with REST API and SMTP, message streams, templates and inbound processing. A small free developer plan, then plans from $15/month for 10,000 emails.
How an agent uses it: The official Postmark MCP server from ActiveCampaign (MIT) has 24 tools to send, template, search and diagnose transactional email.
Best for: Transactional email where you want separate message streams, published overage rates and longer log retention.
Pricing
- Free tier
- Developer: 100 emails/month, no overages, does not expire [source, checked 2026-10-17]
- Entry paid price
- Basic $15/month: 10,000 emails, then $1.80 per 1,000; Pro $16.50 ($1.30 per 1,000); Platform $18 ($1.20 per 1,000) [source, checked 2026-10-17]
- What you pay for (meter)
- Emails per month; extra emails per 1,000 [source]
- Data retention
- 45 days on Basic; customizable up to 365 days on Pro and Platform [source]
For agents
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Other email tools: Resend · Twilio SendGrid · Mailgun · AgentMail
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