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dockers/postfix2/docker-compose.yml

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+version: '3.3'
+
+services:
+  mail:
+    image: docker.io/mailserver/docker-mailserver:latest
+    hostname: ${smtpHost}
+    domainname: ${domain}
+    container_name: ${smtpServName}
+    networks:
+      - postfixNet
+    #ports:
+      #- ${MAIN_IP}:25:25
+    volumes:
+      - mailData:/var/mail
+      - mailState:/var/mail-state
+      - mailLog:/var/log/mail
+      - mailConfig:/tmp/docker-mailserver/
+      - /etc/localtime:/etc/localtime:ro
+      - /etc/timezone:/etc/timezone:ro
+      - /etc/letsencrypt:/etc/letsencrypt:ro
+    environment:
+      - HOSTNAME=${smtpHost}
+      - DOMAINNAME=${domain}
+      - CONTAINER_NAME=${smtpServName}
+    env_file:
+      - env-config
+      - ../../secret/env-${smtpServName}
+    cap_add:
+      - NET_ADMIN
+      - SYS_PTRACE
+    restart: always
+
+volumes:
+  mailData:
+  mailState:
+  mailLog:
+  mailConfig:
+
+networks:
+  postfixNet:
+    external: true
+    name: postfixNet