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S-nail vs Mutt: catalog facts
S-nail	Mutt
Free Free software distributed under multiple BSD, ISC, HPND, and RSA-MD licenses.	Free Free and open source.
Command line	macOS, Linux, Command line
Supports MIME email Provides command-line email sending and reading	Keyboard-driven and fast Works well over SSH
Requires a Unix-like environment	Steep learning curve No graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: BSD-2-Clause AND BSD-3-Clause AND BSD-4-Clause AND ISC AND HPND-sell-variant AND RSA-MD	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 October 8, 2026	Official website Full listing and sources Checked September 24, 2026

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