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Top 10 Shell Postfix Projects
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docker-mailserver
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
Project mention: Giving every AI agent its own mailbox: the architecture behind a self-hosted MCP mail server | dev.to | 2026-07-30So I built openagent.email: a self-hosted mail server where every agent gets its own mailbox on a domain you own. It runs as two containers, a catch-all Postfix/Dovecot mailbox (docker-mailserver) and a small Node/Hono API, with an MCP server on top so any MCP client (Claude Code, Cursor, Windsurf...) can use it. The whole stack idles at about 190 MB of RAM on my production instance, and it has 268 automated tests.
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docker-postfix
Multi architecture simple SMTP server (postfix null relay) host for your Docker and Kubernetes containers. Based on Debian/Ubuntu/Alpine.
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homebox
A set of ansible scripts to build a personal mail server / private cloud / etc. (by progmaticltd)
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postwhite
Script for generating a whitelist for Postfix's Postscreen based on large senders' SPF records
I've been self-hosting my eamil for over 10 years now. I have fallen back to using Amazon's SES to send because all of Digital Ocean's IP blocks suddenly got marked as bad and I don't have enough volume to improve a new IP reputation - https://news.ycombinator.com/item?id=39891262, https://news.ycombinator.com/item?id=38471262
I use Gmail as a free spam harvester to train my own spam filter - https://news.ycombinator.com/item?id=38843288.
But as others here have suggested greylisting is extremely helpful in this space as legitimate servers should always retry. Well only my power company is the exception and they will fall back to sending paper bills, but even Gmail falls foul for them. - https://news.ycombinator.com/item?id=38512732
On greylisting I would say using https://github.com/stevejenkins/postwhite (even if it's very old and not actively maintained) has proven very important for the annoying 2FA emails, I strongly contend that email isn't suitable for this use case but that's another conversation)
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sh
Cross platform Bash shell configuration toolkit that works with apt, pacman/yay, apk and opkg package managers. (by markc)
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Shell Postfix discussion
Shell Postfix related posts
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Giving every AI agent its own mailbox: the architecture behind a self-hosted MCP mail server
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DMARC Has Been Public Since 2012. 68.4% of Domains Still Don't Enforce It
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Self-Hosting Email Like It's 1984
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Does Your Startup Need Complex Cloud Infrastructure?
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Docker Mailserver v14 rebases from Debian 11 Bullseye to Debian 12 Bookworm
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Email server with nginx installed ?
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Self Hosting Email Server
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Index
What are some of the best open-source Postfix projects in Shell? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | docker-mailserver | 18,700 |
| 2 | docker-postfix | 789 |
| 3 | homebox | 491 |
| 4 | docker-postfix | 418 |
| 5 | mailserver | 166 |
| 6 | postwhite | 94 |
| 7 | docker-smtp-relay | 69 |
| 8 | bacula-utils | 49 |
| 9 | SaorTech-cloud-services | 25 |
| 10 | sh | 0 |
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