diff --git a/docker-compose/mail.yml b/docker-compose/mail.yml
index 90dbcfa4b00bfbab83e5fb14824f07a17cb675c8..1396de9a71d18ce955c59f5fb46b775dc1dd6d7c 100644
--- a/docker-compose/mail.yml
+++ b/docker-compose/mail.yml
@@ -29,6 +29,7 @@ services:
       - /DATA/docker/mail/ssl/:/certs-ssl/
    environment:
      - LMTP_LAN_HOSTNAME=pica-mail-mda.pica_mail
+     - ENV LMTP_PORT=1025
      - MY_HOSTNAME=mail-test-picasoft.maliach.fr
    labels:
       - "traefik.frontend.rule=Host:mail-test-picasoft.maliach.fr"