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Maddy vs Stalwart: catalog facts
Maddy	Stalwart
Free Free and open source, self-hosted.	Free Free and open source, self-hosted.
Linux, Self-hosted	Linux, Self-hosted
Single-binary deployment simplifies installation compared to multi-package mail stacks Written in Go with a composable configuration model	Modern JMAP support alongside traditional IMAP and SMTP protocols Rust implementation aims for security and performance
Smaller community and fewer guides than more established mail servers Still requires Linux server administration to run	Requires self-hosting and server administration knowledge Newer project with a smaller ecosystem than long-established mail servers
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.