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Stalwart vs iRedMail: catalog facts
Stalwart	iRedMail
Free Free and open source, self-hosted.	Free Free and open source, self-hosted.
Linux, Self-hosted	Linux, Self-hosted
Modern JMAP support alongside traditional IMAP and SMTP protocols Rust implementation aims for security and performance	Long-established project with broad Linux and BSD distribution support Automates installation of a full mail stack in one script
Requires self-hosting and server administration knowledge Newer project with a smaller ecosystem than long-established mail servers	Requires server administration skills to deploy and maintain Text-based installer is less approachable than fully containerized alternatives
Self-hosted	Self-hosted
Open source	Open source
License not stated	License not stated
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 September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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