Merge pull request #2715 from QYG2297248353/renovate/mailserver-docker-mailserver-15.x

Update mailserver/docker-mailserver Docker tag to v15.1.0

apps/mailserver/15.1.0/docker-compose.yml

@@ -4,7 +4,7 @@ networks:
 
 services:
   mailserver:
-    image: mailserver/docker-mailserver:15.0.2
+    image: mailserver/docker-mailserver:15.1.0
     container_name: ${CONTAINER_NAME}
     labels:
       createdBy: "Apps"