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Stalwart vs Modoboa: catalog facts
Stalwart	Modoboa
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	Simplified web UI lowers the barrier to running a full mail platform Open source and self-hosted, keeping mail data under your control
Requires self-hosting and server administration knowledge Newer project with a smaller ecosystem than long-established mail servers	Requires a Linux server to install and maintain Smaller community than some larger self-hosted mail projects
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.