Compare software

fdmOfflineIMAP
Free

Free, with the source code published on GitHub.

 Free

Free and open source under the GPL.

macOS, Linux, Command line macOS, Linux, Command line
  • Combines fetching and filtering in one program
  • Delivers to Maildir, mbox, IMAP, LMTP or a pipe
  • Two-way sync into plain Maildir, which any local mail client can read
  • Per-folder rules and filters for what gets mirrored
  • No interface for reading mail
  • Configuration takes time to learn
  • Python performance is poor on very large mailboxes
  • Configuration is a hand-written file with many options
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.