diff --git a/.gitignore b/.gitignore
index 11f18e29..f70d11e6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ data/conf/postfix/sni.map.db
 data/conf/postfix/extra.cf
 data/conf/postfix/sql
 data/conf/postfix/custom_transport.pcre
+data/conf/postfix/custom_postscreen_whitelist.cidr
 data/conf/postfix/allow_mailcow_local.regexp
 data/conf/dovecot/sql
 data/conf/dovecot/lua
diff --git a/data/conf/postfix/main.cf b/data/conf/postfix/main.cf
index 64591e6b..8104db52 100644
--- a/data/conf/postfix/main.cf
+++ b/data/conf/postfix/main.cf
@@ -34,6 +34,7 @@ milter_protocol = 6
 minimal_backoff_time = 300s
 plaintext_reject_code = 550
 postscreen_access_list = permit_mynetworks,
+  cidr:/opt/postfix/conf/custom_postscreen_whitelist.cidr,
   cidr:/opt/postfix/conf/postscreen_access.cidr,
   tcp:127.0.0.1:10027
 postscreen_bare_newline_enable = no