> /v1/alternatives/postmark
Open source alternatives to Postmark[005]
Postmark delivers transactional email over SMTP and an API, with per-message tracking, templates and a focus on deliverability. Below are 5 self-hostable open source alternatives, ranked by GitHub popularity.
Plunk
The Open-Source Email Platform
★ STARS
5.0k
⑂ FORKS
341
useSend
Open source alternative to Resend, Sendgrid, Postmark etc.
★ STARS
4.2k
⑂ FORKS
373
Sendune
Free, open source, HTML email template editor and no code designer.
★ STARS
2.1k
⑂ FORKS
131
DoubleZero
A markdown email micro service for the people!
★ STARS
1.2k
⑂ FORKS
66
hyvor-relay
Open-Source Email API for Developers. Self-hosted Alternative to SES, Mailgun, SendGrid.
★ STARS
578
⑂ FORKS
31
// EDITOR'S TAKE
useSend is the closest to Postmark's developer experience, an API plus a real delivery dashboard, but it rides on AWS SES so deliverability is Amazon's reputation rather than a curated transactional network. hyvor-relay actually sends the mail itself, which means you own IP warm-up and blocklist trouble, and Plunk is only worth it if you want marketing broadcasts in the same tool.
// FREQUENTLY ASKED
What is the best open source Postmark alternative?
Plunk is the most popular open source Postmark alternative by GitHub stars (5,050 stars). The other 4 options are ranked above.
Are these Postmark alternatives self-hostable?
Yes — every project listed here is open source and runs on your own infrastructure. Click into a project to see its license, stars, language, and current health status.
Are they free?
All projects shown are free and open source. Check each project's license page for the terms — most are MIT, Apache 2.0, or AGPL.
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