diff --git a/src/apps.js b/src/apps.js
index 81372aa38..07c242a69 100644
--- a/src/apps.js
+++ b/src/apps.js
@@ -161,7 +161,6 @@ function validatePortBindings(portBindings, manifest) {
         993, /* imaps */
         2003, /* graphite (lo) */
         2004, /* graphite (lo) */
-        2020, /* mail server */
         2514, /* cloudron-syslog (lo) */
         constants.PORT, /* app server (lo) */
         constants.SYSADMIN_PORT, /* sysadmin app server (lo) */
diff --git a/src/mail.js b/src/mail.js
index acc4f64b2..08940295c 100644
--- a/src/mail.js
+++ b/src/mail.js
@@ -658,7 +658,6 @@ function configureMail(mailFqdn, mailDomain, callback) {
                             -v "${paths.MAIL_DATA_DIR}:/app/data" \
                             -v "${paths.PLATFORM_DATA_DIR}/addons/mail:/etc/mail" \
                             ${ports} \
-                            -p 127.0.0.1:2020:2020 \
                             --label isCloudronManaged=true \
                             --read-only -v /run -v /tmp ${tag}`;