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fetchmailisync
Free

Free, with source code available on GitLab.

 Free

Free and open source under the GPL.

macOS, Linux, Command line Windows, macOS, Linux, Command line
  • Supports both POP3 and IMAP retrieval
  • Actively maintained with a public security errata page
  • Much faster than Python-based synchronisers on large mailboxes
  • Precise control over which folders sync and in which direction
  • Only fetches mail; reading and filtering need other tools
  • Past security issues in optional NTLM support
  • 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.