diff --git a/postfix/conf/main.cf b/postfix/conf/main.cf
index afe48813..e23dcba7 100644
--- a/postfix/conf/main.cf
+++ b/postfix/conf/main.cf
@@ -31,6 +31,9 @@ relayhost = {{ RELAYHOST }}
 # Recipient delimiter for extended addresses
 recipient_delimiter = {{ RECIPIENT_DELIMITER }}
 
+# XClient for connection from the frontend
+smtpd_authorized_xclient_hosts = {{ FRONT_ADDRESS }}
+
 ###############
 # TLS
 ###############