Compare software

Haraka vs Postfix: catalog facts
Haraka	Postfix
Free Free open-source software.	Free Free and open source.
Linux, Self-hosted, Command line	macOS, Linux, Self-hosted
High performance SMTP handling Flexible plugin system in JavaScript	Security-focused design Runs on many Unix-like systems
Handles SMTP only; needs other software for mailbox access Customisation requires JavaScript knowledge	Transfer agent only; needs a separate IMAP server for mailboxes Configuration requires mail server knowledge
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
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 October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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