Stalwart

📧 Stalwart is a fast, secure, and scalable open-source server for email, calendars, contacts, and file sharing, built in Rust for top-tier performance and safety.

All-in-One Communication Platform

• Full Email Protocol Support: JMAP, IMAP4, POP3, and SMTP with advanced authentication, security, and filtering.
• Collaboration Tools: CalDAV calendars, CardDAV contacts, WebDAV file storage and sharing.
• Spam & Phishing Protection: AI-powered filtering, DNS blocklists, greylisting, sender reputation tracking, and more.

Powerful Features for Any Scale

• Flexible storage backends: PostgreSQL, MySQL, SQLite, S3, Redis, ElasticSearch, and more.
• Built-in encryption, 2FA, and automated TLS certificates.
• Fault-tolerant, cluster-ready design with Kubernetes and Docker support.
• Rich admin dashboard, real-time monitoring, and user self-service tools.

Whether you're running a small private server or a large enterprise deployment, Stalwart delivers modern, secure, and efficient communication you can trust.

These are the configured external port mappings:

• 10443:443 (HTTPS)
• 10025:25 (SMTP)
• 10465:465 (SMTPS)
• 10587:587 (SMTP Submission)
• 10143:143 (IMAP)
• 10993:993 (IMAPS)
• 14190:4190 (Sieve)
• 10110:110 (POP3)
• 10995:995 (POP3S)

You can find more details on how to properly setup your instance here: https://stalw.art/docs/install/platform/docker/