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fdmisync
Free

Free, with the source code published on GitHub.

 Free

Free and open source under the GPL.

macOS, Linux, Command line Windows, macOS, Linux, Command line
  • Combines fetching and filtering in one program
  • Delivers to Maildir, mbox, IMAP, LMTP or a pipe
  • Much faster than Python-based synchronisers on large mailboxes
  • Precise control over which folders sync and in which direction
  • No interface for reading mail
  • Configuration takes time to learn
  • Configuration syntax is terse and mistakes can delete mail
  • Command line only
Downloadable app Downloadable app
Open source Open source
License not stated License: GPL-2.0
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.