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Mutt vs S-nail: catalog facts
Mutt	S-nail
Free Free and open source.	Free Free software distributed under multiple BSD, ISC, HPND, and RSA-MD licenses.
macOS, Linux, Command line	Command line
Keyboard-driven and fast Works well over SSH	Supports MIME email Provides command-line email sending and reading
Steep learning curve No graphical interface	Requires a Unix-like environment
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: BSD-2-Clause AND BSD-3-Clause AND BSD-4-Clause AND ISC AND HPND-sell-variant AND RSA-MD
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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