Compare software

fetchmail vs lieer: catalog facts
fetchmail	lieer
Free Free, with source code available on GitLab.	Free Free and open source under the GPL-3.0 or later.
macOS, Linux, Command line	macOS, Linux, Command line
Supports both POP3 and IMAP retrieval Actively maintained with a public security errata page	Two-way sync between Gmail labels and notmuch tags Keeps a full local maildir copy of the mailbox
Only fetches mail; reading and filtering need other tools Past security issues in optional NTLM support	Only works with Gmail accounts Requires notmuch and command-line setup
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	Account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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