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GNU Mailutils vs S-nail: catalog facts
GNU Mailutils	S-nail
Free Free and open source under the GPL-3.0-or-later license.	Free Free software distributed under multiple BSD, ISC, HPND, and RSA-MD licenses.
Linux, Command line	Command line
Works with local and remote mailbox formats Includes mail reading, retrieval and filtering utilities	Supports MIME email Provides command-line email sending and reading
Primarily a command-line and server-side package Library components are aimed at developers integrating mail handling	Requires a Unix-like environment
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: BSD-2-Clause AND BSD-3-Clause AND BSD-4-Clause AND ISC AND HPND-sell-variant AND RSA-MD
Not stated if an account is 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 October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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