# ----- Main settings -----
acl_smtp_rcpt = accept
+acl_smtp_data = check_data
# ----- Authentication -----
server_mail_auth_condition = ${if eq{$authenticated_id}{userx}{yes}}
+# ----- ACL -----
+begin acl
+
+check_data:
+ accept add_header = :at_start:${authresults {$primary_hostname}}
+
# ----- Routers -----
begin routers