Stalwart SMTP

Stalwart SMTP: A Modern SMTP Server for Security, Speed, and Extensive Configurability

Stalwart SMTP is a modern SMTP server designed with a focus on security, speed, and extensive configurability. Developed in Rust, this project offers a robust and highly extensible platform for handling email communication.

Main Features of Stalwart SMTP:

Sender and Message Authentication:

• Domain- based Message Authentication, Reporting, and Conformance (DMARC) verification and failure/aggregate reporting.
• DomainKeys Identified Mail (DKIM) verification, signing, and failure reporting.
• Sender Policy Framework (SPF) policy evaluation and failure reporting.
• Authenticated Received Chain (ARC) verification and sealing.
• Reverse IP (iprev) validation.

Strong Transport Security:

• DNS-Based Authentication of Named Entities (DANE) Transport Layer Security.
• SMTP MTA Strict Transport Security (MTA-STS).
• SMTP TLS Reporting (TLSRPT) delivery and analysis.

Inbound Filtering and Throttling:

• Sieve scripting language with support for all registered extensions.
• Milter support for integration with external content filtering systems such as SpamAssassin and ClamAV.
• Address rewriting.
• Filtering, modification, and removal of message parts or headers.
• Inbound concurrency & rate limiting.

As a developer, you can help by becoming a sponsor. For more information on sponsorship, please visit liberapay.com/stalwartlabs.

Remember to review the project's license and terms before contributing.