diff --git a/.env.sample b/.env.sample
index 035b649..5b8f575 100644
--- a/.env.sample
+++ b/.env.sample
@@ -31,6 +31,9 @@ TRAEFIK_STACK_NAME=traefik_example_com
 # OPTIONAL SETTINGS                                                           #
 ###############################################################################
 
+# Uncomment this to reënable STARTTLS, although beware the health warnings here: https://nostarttls.secvuln.info/
+#PORTS=25,80,443,465,993,995,4190,110,143,587
+
 # Name of the instance, displayed in the web UI
 SITENAME=mymail
 
diff --git a/compose.yml b/compose.yml
index ae3eb3d..a748940 100644
--- a/compose.yml
+++ b/compose.yml
@@ -52,6 +52,7 @@ x-environment:
   - WELCOME_BODY
   - WELCOME_SUBJECT
   - TZ
+  - PORTS
 
 services:
   app: