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Pop vs msmtp: catalog facts
Pop	msmtp
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free software with no paid tier.
Windows, macOS, Linux, Command line	macOS, Linux, Command line
Offers interactive composition and a scriptable command-line mode.	Drop-in replacement for the sendmail command Multiple accounts in one configuration file
Requires SMTP credentials or a supported sending-service account.	Sends mail only; it does not read or fetch messages Configured through a text file with no graphical setup
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
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.