diff --git a/pica-mail/docker-compose.yml b/pica-mail/docker-compose.yml
index 12d619d399505b23723ca751afdbea09b2b892bc..8226d5cfee3a995159a803f5ddc3233983660ce7 100644
--- a/pica-mail/docker-compose.yml
+++ b/pica-mail/docker-compose.yml
@@ -40,6 +40,7 @@ services:
     build: ./pica-mail-mta
     container_name: pica-mail-mta
     ports:
+      - "25:25"
       - "587:587"
     networks:
       - mail