diff --git a/krebs/3modules/exim-smarthost.nix b/krebs/3modules/exim-smarthost.nix
index 5923b610d..218d83ab4 100644
--- a/krebs/3modules/exim-smarthost.nix
+++ b/krebs/3modules/exim-smarthost.nix
@@ -181,6 +181,8 @@ let
           accept
 
         acl_check_mail:
+          accept
+            authenticated = *
           accept
             sender_domains = +sender_domains
             hosts = +relay_from_hosts