diff --git a/compose.yaml b/compose.yaml
index 37c42c7c..e9c49596 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -9,7 +9,7 @@ services:
     # https://docker-mailserver.github.io/docker-mailserver/latest/config/security/understanding-the-ports/
     # To avoid conflicts with yaml base-60 float, DO NOT remove the quotation marks.
     ports:
-      - "25:25"    # SMTP  (explicit TLS => STARTTLS)
+      - "25:25"    # SMTP  (explicit TLS => STARTTLS, Authentication is DISABLED => use port 465/587 instead)
       - "143:143"  # IMAP4 (explicit TLS => STARTTLS)
       - "465:465"  # ESMTP (implicit TLS)
       - "587:587"  # ESMTP (explicit TLS => STARTTLS)