add docker-mailserver

docker-mailserver/docker-compose.yml

@@ -0,0 +1,49 @@
+networks:
+  discourse:
+    external: true
+
+services:
+  mailserver:
+    image: ghcr.io/docker-mailserver/docker-mailserver:14.0.0@sha256:01b82c6c1c64d5b73ba161c0107e5d7d038ebdce85eb9ed084f043e9c2a7943b
+    container_name: mailserver
+    # If the FQDN for your mail-server is only two labels (eg: example.com),
+    # you can assign this entirely to `hostname` and remove `domainname`.
+    hostname: cups-g11
+    domainname: aosus.org
+    env_file: mailserver.env
+    # More information about the mail-server ports:
+    # https://docker-mailserver.github.io/docker-mailserver/latest/config/security/understanding-the-ports/
+    # To avoid conflicts with yaml base-60 float, DO NOT remove the quotation marks.
+    ports:
+      - "25:25"    # SMTP  (explicit TLS => STARTTLS)
+      # - "143:143"  # IMAP4 (explicit TLS => STARTTLS)
+      # - "465:465"  # ESMTP (implicit TLS)
+      - "587:587"  # ESMTP (explicit TLS => STARTTLS)
+      # - "993:993"  # IMAP4 (implicit TLS)
+      # - "110:110"  # POP3
+      - "995:995"  # POP3 (with TLS)
+    volumes:
+      - mail-data:/var/mail
+      - mail-state:/var/mail-state
+      - mail-logs:/var/log/mail
+      - config:/tmp/docker-mailserver
+      - /etc/localtime:/etc/localtime:ro
+      - caddy_data:/caddy-data:ro
+    restart: always
+    stop_grace_period: 1m
+    cap_add:
+      - NET_ADMIN
+    healthcheck:
+      test: "ss --listening --tcp | grep -P 'LISTEN.+:smtp' || exit 1"
+      timeout: 3s
+      retries: 0
+    networks:
+      discourse:
+
+volumes:
+  mail-data:
+  mail-state:
+  mail-logs:
+  config:
+  caddy_data:
+    external: true