use traefik instead of letsencrypt

docker-mailserver/docker-compose.yml

@@ -1,11 +1,25 @@
 version: "3.8"
 
 services:
+  traefik:
+    image: "traefik:v2.4.8"
+    ports:
+      - "443:443"
+    volumes:
+      - "./traefik.yaml:/etc/traefik/traefik.yaml:ro"
+      - "./letsencrypt:/letsencrypt"
+      - "/var/run/docker.sock:/var/run/docker.sock:ro"
+    restart: unless-stopped
+
+  whoami:
+    image: docker.io/traefik/whoami:latest
+    labels:
+      - "traefik.http.routers.whoami.rule=Host(`mail.zweili.org`)"
+
   mail:
     image: docker.io/mailserver/docker-mailserver:9.1.0
-    hostname: ${HOSTNAME}
-    domainname: ${DOMAINNAME}
-    container_name: ${CONTAINER_NAME}
+    hostname: mail
+    domainname: zweili.org
     env_file: mailserver.env
     # To avoid conflicts with yaml base-60 float, DO NOT remove the quotation marks.
     ports:
@@ -14,24 +28,11 @@ services:
       - "587:587"
       - "993:993"
     volumes:
-      - ./letsencrypt/etc/letsencrypt/:/etc/letsencrypt
+      - ./letsencrypt/acme.json:/etc/letsencrypt/acme.json
       - ./maildata:/var/mail
       - ./mailstate:/var/mail-state
       - ./maillogs:/var/log/mail
-      - ./config/:/tmp/docker-mailserver/${SELINUX_LABEL}
+      - ./config/:/tmp/docker-mailserver/
       - /etc/localtime:/etc/localtime:ro
     restart: unless-stopped
     cap_add: ["NET_ADMIN", "SYS_PTRACE"]
-
-  letsencrypt:
-    image: linuxserver/letsencrypt
-    container_name: letsencrypt
-    cap_add:
-      - NET_ADMIN
-    env_file: letsencrypt.env
-    volumes:
-      - ./letsencrypt:/config
-    ports:
-      - 80:80
-      - 443:443
-    restart: unless-stopped

docker-mailserver/traefik.yaml

@@ -0,0 +1 @@
+../traefik.yaml