Mailgun

Mailgun has long positioned itself as the developer-friendly alternative to SendGrid. The API is well-documented, SMTP is first-class, and routing rules are powerful. Still a strong pick for technical teams that want SMTP relay plus rich routing.

At an early stage the deciding factors are what the free tier actually covers, what the first paid invoice looks like, and how much of a founding engineer's week the setup costs. Feature depth that only matters at a million sends a month is noise until it is not.

Against a waitlist, a launch announcement, onboarding email, and the first transactional sends, Mailgun covers developer experience, scheduling, SDK breadth, and webhook coverage, and does not cover best published rate per 1,000 and operating track record. Whether that gap matters depends on how central those are to the build.

• Free tier: 100/day permanent free plan
• Best published rate per 1,000: $0.70
• Starts at: $15/mo for 10,000 emails (Basic)
• DX score: 7/10
• Deliverability: Generally good, with deliverability monitoring tools available on higher tiers. Inbound routes and suppressions are battle-tested.
• Operating since: 2010
• Scheduling: Yes
• SDKs: node, python, go, ruby, php, java
• Webhooks: Yes

Generally good, with deliverability monitoring tools available on higher tiers. Inbound routes and suppressions are battle-tested.

Technical teams that want SMTP relay plus advanced routing.

Teams that need a generous free tier or simple billing.