Postmark vs Mailgun

Based on our independent scoring across 6 dimensions, Postmark scores 86/100 overall versus Mailgun's 78/100 — a 8-point margin. Postmark leads on Deliverability in particular. That said, Mailgun may still be the right choice if the dimensions where it scores higher match your specific priorities — the radar chart above shows the full profile side by side.

Mailgun is cheaper at the entry level — it offers a permanent free tier, while Postmark starts at $15/month. If budget is the primary constraint, Mailgun is the lower-risk starting point. Postmark's paid features may justify the cost — compare the plan limits before committing.

Postmark scores higher on Deliverability — 96/100 versus 80/100 for Mailgun. If deliverability is your primary decision criterion, Postmark is the stronger choice in this head-to-head.

Switching between transactional email tools is generally possible but involves migration effort: exporting your data or configuration from Postmark, re-importing or reconfiguring in Mailgun, and updating any API integrations or environment variables in your codebase. The effort scales with how deeply embedded the tool is in your stack. Test Mailgun on a non-production project first before migrating.

Postmark (86/100) is the better fit for teams who prioritise deliverability — its strongest dimension — and who want a low-cost starting price. Mailgun (78/100) is the better fit for teams who prioritise analytics & logs and want a free entry point. If both dimensions matter equally, the overall score winner (Postmark) is the safer default choice.