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Claws Mail vs Evolution: catalog facts
Claws Mail	Evolution
Free Free and open source under the GPL 3.0 or later.	Free Free and open source, part of the GNOME project.
Windows, macOS, Linux	Linux
Opens and searches enormous mail folders without stalling Plugins for PGP, spam filtering, RSS and calendars ship with it	Mail, calendar, contacts and tasks in one program Exchange Web Services plugin connects to Microsoft 365
Composes plain text by default; HTML mail sending is deliberately limited The interface is functional and looks like it was designed in 2004	Linux only Heavier than a mail-only client, and slower to start
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-2.0-or-later and LGPL-2.1-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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