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fdm vs fetchmail: catalog facts
fdm	fetchmail
Free Free, with the source code published on GitHub.	Free Free, with source code available on GitLab.
macOS, Linux, Command line	macOS, Linux, Command line
Combines fetching and filtering in one program Delivers to Maildir, mbox, IMAP, LMTP or a pipe	Supports both POP3 and IMAP retrieval Actively maintained with a public security errata page
No interface for reading mail Configuration takes time to learn	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 not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it 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.