SMTP Server

Modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability.

Key features

Sender and Message Authentication

Features built-in DMARC, DKIM, SPF and ARC support for message authentication.

Strong Transport Security

Supports DANE, MTA-STS and SMTP TLS reporting.

Powered by Rust

Incredibly fast while ensuring memory safety. No runtimes or garbage collectors.

Frequently asked questions

If you have a question that is not listed here you may use the contact form below or write to us on Discord.

You can get help from the community by starting a discussion on Github or Discord. You may also become a sponsor and get support directly from Stalwart Labs Ltd.
Stalwart JMAP stores all metadata and settings in SQLite or in FoundationDB, a high performance distributed database. E-mail messages are stored separately from metadata, directly in the file system using Maildir or alternatively on the S3-storage of your choice.