Compare software

Postfix vs chasquid: catalog facts
Postfix	chasquid
Free Free and open source.	Free Free and open source under the Apache 2.0 licence.
macOS, Linux, Self-hosted	Linux, Self-hosted
Security-focused design Runs on many Unix-like systems	Secure defaults that prevent open relays Virtual domains with per-domain users and aliases
Transfer agent only; needs a separate IMAP server for mailboxes Configuration requires mail server knowledge	Aimed at individuals and small groups rather than large deployments Needs Dovecot or similar for mailbox access
Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Not stated if it 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.