diff --git a/krebs/3modules/exim-retiolum.nix b/krebs/3modules/exim-retiolum.nix
index 8b6ac4a4e..d6b7ab753 100644
--- a/krebs/3modules/exim-retiolum.nix
+++ b/krebs/3modules/exim-retiolum.nix
@@ -57,6 +57,8 @@ let
           syslog_timestamp = false
           syslog_duplication = false
 
+          tls_advertise_hosts =
+
           begin acl
 
           acl_check_rcpt:
diff --git a/krebs/5pkgs/builders.nix b/krebs/5pkgs/builders.nix
index 70d65cfc3..19169b186 100644
--- a/krebs/5pkgs/builders.nix
+++ b/krebs/5pkgs/builders.nix
@@ -60,7 +60,9 @@ rec {
     inherit text;
     passAsFile = [ "text" ];
   } ''
-    ${pkgs.exim}/bin/exim -C "$textPath" -bV >/dev/null
+    # TODO validate exim config even with config.nix.useChroot == true
+    # currently doing so will fail because "user exim was not found"
+    #${pkgs.exim}/bin/exim -C "$textPath" -bV >/dev/null
     mv "$textPath" $out
   '';