SMTP Server in Rust with DMARC, Dane, MTA-STS, Sieve, OTEL Support
I am happy to announce Stalwart SMTP [1], a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability. It features built-in DMARC, DKIM, SPF and ARC support for message authentication, strong transport security through DANE, MTA-STS and SMTP TLS reporting, and offers great flexibility and customization thanks to its dynamic configuration rules and native support for Sieve scripts. The project has been recently awarded a grant from NLNet and the European Commission's Next Generation Internet program to develop a mail server in Rust. The next step in…
In plain words
Stalwart SMTP is a mail server written in Rust that handles email authentication through DMARC, DKIM, SPF, and ARC protocols. It provides transport security via DANE and MTA-STS, supports Sieve scripting for message filtering, and offers dynamic configuration rules for customization. Built for security and performance, it is designed for system administrators and organizations managing email infrastructure.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I am happy to announce Stalwart SMTP [1], a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability. It features built-in DMARC, DKIM, SPF and ARC support for message authentication, strong transport security through DANE, MTA-STS and SMTP TLS reporting, and offers great flexibility and customization thanks to its dynamic configuration rules and native support for Sieve scripts. The project has been recently awarded a grant from NLNet and the European Commission's Next Generation Internet program to develop a mail server in Rust. The next step in the roadmap is to refactor the code base of the previously released Stalwart JMAP[2]/IMAP[1] servers and to create an integrated mail server solution that is simple to install and manage. Any comments or suggestions are more than welcome! [1]: https://github.com/stalwartlabs/smtp-server [2]: https://github.com/stalwartlabs/jmap-server [3]: https://github.com/stalwartlabs/imap-server
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