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Mailpit vs smtp4dev: catalog facts
Mailpit	smtp4dev
Free Free to download and run.	Free Free to download, with the source code published on GitHub.
Web, Self-hosted, Command line	Web, Self-hosted
Single binary or Docker image with no dependencies HTML compatibility, link and spam checks built in	Captures outgoing email so test messages never reach real inboxes Web interface for inspecting captured messages
For testing only, not a real mail client Spam scoring relies on a SpamAssassin setup	Meant for development and testing, not for sending real mail Documentation lives mainly in the repository
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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