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S-nail vs GNU Mailutils: catalog facts
S-nail	GNU Mailutils
Free Free software distributed under multiple BSD, ISC, HPND, and RSA-MD licenses.	Free Free and open source under the GPL-3.0-or-later license.
Command line	Linux, Command line
Supports MIME email Provides command-line email sending and reading	Works with local and remote mailbox formats Includes mail reading, retrieval and filtering utilities
Requires a Unix-like environment	Primarily a command-line and server-side package Library components are aimed at developers integrating mail handling
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: GPL-3.0-or-later
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.