Stalwart

Stalwart is an all-in-one open-source mail server written in Rust. Supports SMTP, IMAP, JMAP, and ManageSieve — with DMARC, DKIM, SPF, and ARC. Designed for speed, security, and modern standards. Replace your aging Postfix/Dovecot stack.

Founded: 2022
Category: Open Source
Funding: Bootstrapped

Every fact above is shown only where it could be checked against a source: funding against a primary source, backers against the investor’s own directory, and a location only where the company names that city on its own site. A row that is absent is one we could not source, not a zero. The summary is a written description of the company. Category is our own classification. Spotted something wrong? Tell us.