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isyncfetchmail
Free

Free and open source under the GPL.

 Free

Free, with source code available on GitLab.

Windows, macOS, Linux, Command line macOS, Linux, Command line
  • Much faster than Python-based synchronisers on large mailboxes
  • Precise control over which folders sync and in which direction
  • Supports both POP3 and IMAP retrieval
  • Actively maintained with a public security errata page
  • Configuration syntax is terse and mistakes can delete mail
  • Command line only
  • Only fetches mail; reading and filtering need other tools
  • Past security issues in optional NTLM support
Downloadable app Downloadable app
Open source Open source
License: GPL-2.0 License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 1, 2026

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