Docker Mailserver

Docker Mailserver is a production-ready, full-stack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus) running inside a single Docker container. Originally created by Thomas VIAL and now maintained by the Docker Mailserver community, it has over 15,000 stars as of 2026. Designed for simplicity and ease of deployment, Docker Mailserver bundles all essential email services into one container, requiring only Docker to run a fully functional mail server. Key components and features include: Postfix (the MTA for SMTP sending and receiving), Dovecot (IMAP and POP3 server for mailbox access with STARTTLS and SSL/TLS encryption), Amavis (interface between MTA and content filters), SpamAssassin (spam detection with Bayesian filtering and DNSBL lookups), ClamAV (open-source antivirus scanning for email attachments), OpenDKIM (DomainKeys Identified Mail signing and verification for email authentication), OpenDMARC (DMARC policy enforcement for preventing email spoofing), Fail2ban (intrusion prevention by banning IPs with failed authentication attempts), Postgrey (greylisting for reducing spam), and Policyd-SPF (Sender Policy Framework checking). Management is via the setup.sh script providing commands for adding email accounts (setup email add user@domain password), aliases (setup alias add alias@domain target@domain), domain management (setup domain add domain.com), relay configuration, DKIM key generation, and configuration updates. Docker Mailserver supports Let us Encrypt certificates, LDAP and OAuth2 authentication, Catch-all addresses, sieve filtering, and per-domain configuration.