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Open source alternatives to SendGrid

We track 4 open-source SendGrid alternatives, of which 0 currently score 70 or above on Repoly's GitHub health scale and 1 ship a Docker image. Postal leads on health at 65/100 with 3 commits in the last 90 days; across all 4 projects you are choosing between GPL-3.0, IPL-1.0, MIT.

4
Alternatives
29k
Combined stars
17
Commits / 90 days
1
With Docker
Licence family Licence

Showing 4 of 4 tools

All 4 SendGrid alternatives, ranked by health

  • Top pick · highest health

    Postal

    65 SLOWING

    Complete and fully featured mail server for use by websites & web servers.

    ★ 17k · ⟳ yesterday · 3.3.7 · MIT

    DockerRuby
    Website ↗ Source ↗

  • Haraka

    65 SLOWING

    Fast, highly extensible, and event driven SMTP server.

    ★ 5.6k · ⟳ 9 days ago · v3.3.4 · MIT

    Nodejs
    Website ↗ Source ↗

  • Maddy Mail Server

    51 SLOWING

    All-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon.

    ★ 6.1k · ⟳ 12 days ago · v0.9.5 · GPL-3.0

    Go
    Website ↗ Source ↗

SendGrid alternatives: common questions

What is the most maintained open source alternative to SendGrid?

Postal scores highest at 65/100, with 3 commits in the last 90 days, 17k GitHub stars and its latest release (3.3.7) published 3 months ago. Haraka has the most raw commit activity at 13 commits in 90 days.

Which SendGrid alternatives use a permissive licence?

2 of 4 are permissively licensed (MIT, Apache, BSD or similar): Postal (MIT), Haraka (MIT). 1 use copyleft licences such as GPL or AGPL, which require you to publish changes if you distribute a modified version.

Which SendGrid alternatives run in Docker?

1 of 4 publish a Docker image or Compose file: Postal. Docker support contributes 10 of the 100 available health points, because it is the clearest signal that self-hosting is a supported path rather than an afterthought.