Postal
Postal is an open-source, self-hosted app in the Email Servers category, licensed MIT and written mainly in Ruby. It is a self-hosted alternative to Twilio SendGrid and Mailgun and ships a Docker image. It has 16,893 GitHub stars and its last commit was on Oct 20, 2026 (data as of Oct 26, 2026).
GitHub stats
- GitHub stars
- 16,893
- Forks
- 1,314
- Open issues
- 50
- Commits, last 12 months
- 18
- Last commit
- Oct 20, 2026
- Latest release
- 3.3.7Jun 3, 2026
- Created
- Apr 19, 2017
- License
- MITOpen source
Data as of from the GitHub API. Report an error
Project health
ActiveActive: last commit Oct 20, 2026, last release Jun 3, 2026.
- Security policyPublishes a security policy on GitHub
| Last commit | Oct 20, 2026 |
|---|---|
| Commits, last 12 months | 18 |
| Latest release | 3.3.7 (Jun 3, 2026) |
| Releases, last 12 months | 3 |
| Releases, all time | 30 |
| Open issues | 50 |
| Open pull requests | 46 |
| Good first issues | 0 |
| Contributing guide | Yes |
| Security policy | Yes |
| Created | Apr 19, 2017 |
Health as of , from the GitHub API. A label describes activity, not quality or security. How we label project health · Report a data error
About Postal
Complete and fully featured mail server for use by websites & web servers.
Description adapted from awesome-selfhosted (CC BY-SA 3.0). Source code: github.com/postalserver/postal.
Topics
- ruby
- smtp
- postal
- mail-server
Open-source alternative to
Postal can replace these commercial products. Compare every option on each page.
Repository preview
Similar apps
More apps like Postal
Other projects in Email Servers, ranked by GitHub stars.
docker-mailserver
docker-mailserver/docker-mailserver
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database.
Active · last commit Oct 25, 2026
Email ServersShellDockerMail-in-a-Box
mail-in-a-box/mailinabox
Turns any Ubuntu server into a fully functional mail server with one command.
Active · last commit Oct 22, 2026
Email ServersPythonStalwart Mail Server
stalwartlabs/stalwart
All-in-one mail server with JMAP, IMAP4, and SMTP support and a wide range of modern features.
Active · last commit Oct 20, 2026
Email ServersRustDockerMailcow
mailcow/mailcow-dockerized
Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration.
Active · last commit Oct 25, 2026
Email ServersJavaScriptDockerMailu
Mailu/Mailu
Simple yet full-featured mail server as a set of Docker images.
Active · last commit Oct 25, 2026
Email ServersPythonDockerRoundcube
roundcube/roundcubemail
Browser-based IMAP client with an application-like user interface.
Active · last commit Oct 25, 2026
Email ServersPHP
Is Postal free and open source?
Yes. Postal is open-source software released under the MIT license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.
Can I run Postal with Docker?
Yes. Postal provides a Docker image, so you can run it on any Linux server with Docker and Docker Compose installed. The project README lists the image name and the environment variables to set.
What are the best alternatives to Postal?
Popular self-hosted alternatives to Postal include docker-mailserver, Mail-in-a-Box and Stalwart Mail Server. Postal itself is a self-hosted alternative to Twilio SendGrid and Mailgun.
Is Postal actively maintained?
The most recent commit to Postal was on Oct 20, 2026 with 18 commits in the past twelve months. The latest release is 3.3.7, published Jun 3, 2026. It had 50 open issues on GitHub. appsgit's project-health label for it is "Active" as of Oct 26, 2026.