diff --git a/test/docker_mail/templates/mailu/overrides/postfix/postfix.cf b/test/docker_mail/templates/mailu/overrides/postfix/postfix.cf
index 9cb2d76780c6930320d943ae9f02f3ce7249684c..48b54f2e4bd8fc38df784d8b6cf08acd2915a760 100644
--- a/test/docker_mail/templates/mailu/overrides/postfix/postfix.cf
+++ b/test/docker_mail/templates/mailu/overrides/postfix/postfix.cf
@@ -10,5 +10,5 @@ owner_request_special = no
 unknown_local_recipient_reject_code = 550
 
 local_recipient_maps = regexp:/opt/mailman/postfix_lmtp
-transport_maps = regexp:/opt/mailman/postfix_lmtp \lmdb:/etc/postfix/transport.map \${podop}transport
-virtual_mailbox_maps = regexp:/opt/mailman/postfix_lmtp \${podop}mailbox
+transport_maps = regexp:/opt/mailman/postfix_lmtp, lmdb:/etc/postfix/transport.map, ${podop}transport
+virtual_mailbox_maps = regexp:/opt/mailman/postfix_lmtp, ${podop}mailbox