Stalwart: All-in-One Mail & Collaboration Server

Stalwart is an open-source mail and collaboration server designed to be secure, scalable, and fluent in various protocols including IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV. Written in Rust, it aims to provide a robust solution for email and collaboration needs.

Key features include:

• Protocol Support - Comprehensive support for JMAP, IMAP, POP3, SMTP, CalDAV, CardDAV, and WebDAV.
• Security Features - Built-in DMARC, DKIM, SPF support, and strong transport security measures.
• Collaboration Tools - Calendaring, contact management, and file storage capabilities.
• Spam Filtering - Advanced spam and phishing protection mechanisms.
• Scalability - Designed for seamless growth from small setups to large-scale deployments.

Stalwart is suitable for organizations looking for a comprehensive mail solution that integrates collaboration features while ensuring security and scalability.