Docker Mailserver

Docker Mailserver is an open-source application that provides a complete mail server solution running inside a container. It integrates several core services including Postfix for SMTP and Dovecot for IMAP and POP3. The system includes built in security and filtering tools such as SpamAssassin for anti spam and ClamAV for antivirus protection. It also supports OpenDKIM and OpenDMARC to improve email deliverability and authentication.

The software is designed to be simple to deploy and upgrade by relying exclusively on configuration files rather than a SQL database. This approach allows users to keep their server settings versioned and portable across different environments. For authentication, it supports SMTP, LDAP, and OAuth2 via XOAUTH2 or OAUTHBEARER SASL mechanisms. It also provides support for various SSL certificate types, including Let's Encrypt, manual, and self signed certificates to ensure secure communication.

Installation and maintenance are handled through a dedicated setup script that assists with initial configuration and ongoing management. The application is intended for users who need a self hosted email infrastructure that can be managed via Docker or Kubernetes. It functions as a backend mail system and does not include a webmail interface, meaning it is used in conjunction with a separate email client. The project is maintained by a community of volunteers and focuses on providing a production ready environment that remains easy to maintain. It is positioned as a fullstack solution for those who prefer a containerized approach to mail server administration.