Ports Reference

Services and ports exposed by docker-mailserver.

Service	Address
POP3 (STARTTLS required)	127.0.0.1:110
POP3S	127.0.0.1:995
IMAP (STARTTLS required)	127.0.0.1:143
IMAPS	127.0.0.1:993
SMTP	127.0.0.1:25
Mail Submission (STARTTLS required)	127.0.0.1:587
Management Interface	http://127.0.0.1:81/manager/
Webmail	http://127.0.0.1:81/webmail/
Rspamd web interface	http://127.0.0.1:81/rspamd/

Binding and exposure

The base docker-compose.yml creates no host port bindings. bin/production.sh includes docker-compose.production.yml, which binds all mail and web ports to 0.0.0.0 — making them accessible from the internet. Use host firewall rules to control which source IPs can reach these ports.

The management interface, webmail, and Rspamd web interface (port 81) use plain HTTP. Terminate TLS at a reverse proxy before exposing these to a network. See How to configure a reverse proxy.