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OfflineIMAP vs getmail6: catalog facts
OfflineIMAP	getmail6
Free Free and open source under the GPL.	Free Free and open source.
macOS, Linux, Command line	macOS, Linux, Command line
Two-way sync into plain Maildir, which any local mail client can read Per-folder rules and filters for what gets mirrored	Supports POP3, IMAP and their SSL variants Delivers to maildir, mbox or an external MDA
Python performance is poor on very large mailboxes Configuration is a hand-written file with many options	Command line and config files only Retrieves mail but does not send or display it
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
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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