The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

Web and API based SMTP testing

📧 Easy to use, yet comprehensive library for sending mails with Go

XARF - eXtended Abuse Reporting Format

JMAP Webmail built for the 21st Century. A modern, self-hosted email client for Stalwart Mail Server powered by the JMAP protocol. Email, calendar, contacts and files. Fast, private, and open source.