Best Transactional Email · head-to-head
Postmark vs MailerSend
A sourced, side-by-side comparison for transactional email. Postmark has the lower entry price. Every figure links to the vendor's own page and the date we captured it.
At a glance
- Price: Postmark $0/mo vs MailerSend $0/mo — Postmark is cheaper to start.
- Free tier: Postmark Yes; MailerSend Yes.
- HIPAA: Postmark —; MailerSend —.
Side by side
| Postmark | MailerSend | |
|---|---|---|
| Entry price | $0/mo (Free) | $0/mo (Free) |
| Free tier | Yes | Yes |
| HIPAA (BAA) | — | — |
| SOC 2 | — | — |
| GDPR | Yes | Yes |
| Best for | Teams where transactional deliverability is non-negotiable | SaaS teams needing both transactional email and SMS from one API |
Sources — Postmark: postmarkapp.com (verified 2026-06-13). MailerSend: mailersend.com (verified 2026-06-13).
Key features
Postmark: Message Streams — separate infrastructure for transactional vs. promotional to protect deliverability; Inbound email processing (parse incoming emails into webhooks); MCP server integration for AI coding tools (Claude Code, Cursor, GitHub Copilot); 95%+ customer satisfaction rating; premium support included on all paid tiers; EU data protection and GDPR compliance with DPA available
MailerSend: Drag-and-drop, HTML, and rich-text template editors in one platform; Transactional SMS API for US and Canada alongside email; DMARC monitoring dashboard; MCP server integration (advertised as NEW feature); GDPR-compliant data handling with EU data residency support