Open source imap projects
Every project in the registry tagged imap, ranked by real GitHub adoption.
Bichon – A lightweight, high-performance Rust email archiver with WebUI
Decentralized private messenger with chat-shared tools and games for Desktop
DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at
Official master for the Greenmail project
Related tags
Frequently asked questions
How many open source imap projects are there?
This registry tracks 4 projects tagged imap, with 5,218 GitHub stars between them. The most-adopted is bichon at 2,064 stars.
Are these imap projects free to use?
Yes — 4 of the 4 carry an explicit open-source licence across 4 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which imap project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these imap projects still maintained?
4 of the 4 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.