Mail

mail-relay/docker-compose.yml

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+services:
+  mail-relay:
+    image: ${MAIL_RELAY_IMAGE}
+    container_name: mail-relay
+    restart: unless-stopped
+    environment:
+      TZ: ${TZ}
+      LOG_FORMAT: ${MAIL_RELAY_LOG_FORMAT}
+
+      # Hostname del relay
+      POSTFIX_myhostname: ${MAIL_RELAY_HOSTNAME}
+
+      # Solo clientes internos del stack de correo
+      POSTFIX_mynetworks: ${MAIL_RELAY_MYNETWORKS}
+
+      # Dominios permitidos para el sender
+      ALLOWED_SENDER_DOMAINS: ${MAIL_RELAY_ALLOWED_SENDER_DOMAINS}
+
+      # Reescritura de dominio para hosts internos
+      MASQUERADED_DOMAINS: ${MAIL_RELAY_MASQUERADED_DOMAINS}
+
+      # Relay SMTP externo
+      RELAYHOST: ${MAIL_RELAY_SMARTHOST}
+      RELAYHOST_USERNAME: ${MAIL_RELAY_SMARTHOST_USERNAME}
+      RELAYHOST_PASSWORD_FILE: /run/secrets/relayhost_password
+      POSTFIX_smtp_tls_security_level: ${MAIL_RELAY_SMTP_TLS_SECURITY_LEVEL}
+
+      # DKIM
+      DKIM_AUTOGENERATE: ${MAIL_RELAY_DKIM_AUTOGENERATE}
+      DKIM_SELECTOR: ${MAIL_RELAY_DKIM_SELECTOR}
+
+    volumes:
+      - ${MAIL_RELAY_QUEUE_PATH}:/var/spool/postfix:Z
+      - ${MAIL_RELAY_DKIM_KEYS_PATH}:/etc/opendkim/keys:Z
+      - ${MAIL_RELAY_PASSWORD_FILE_PATH}:/run/secrets/relayhost_password:ro,Z
+
+    networks:
+      mail_internal:
+        ipv4_address: ${MAIL_RELAY_IPV4}
+
+    # No publicar puertos al exterior para uso interno entre contenedores.
+    # Descomenta para pruebas desde el host:
+    # ports:
+    #   - "127.0.0.1:1587:587"
+
+networks:
+  mail_internal:
+    name: ${MAIL_RELAY_NETWORK_NAME}
+    driver: bridge
+    ipam:
+      config:
+        - subnet: ${MAIL_RELAY_SUBNET}