diff --git a/smmapdfw/m4/verifysender.m4 b/smmapdfw/m4/verifysender.m4
index e415d9c..e1eb6c9 100644
--- a/smmapdfw/m4/verifysender.m4
+++ b/smmapdfw/m4/verifysender.m4
@@ -93,6 +93,7 @@ Kverifier_helper _VERIFIER_WHITELIST_', `dnl
 Kverifier_helper _VERIFIER_BLACKLIST_')
 Kvht_logger syslog
 C{verifier_fix_white} postmaster
+Kvbestmx bestmx
 
 LOCAL_RULESETS
 # This ruleset can be used to test the verifier in -bt mode
@@ -102,7 +103,9 @@ R$+					$: < $(verifier $1 $:none $) >
 Sverifier0
 R< $={verifier_fix_white} @ $+ >	$@ < ok >
 R< $+ @ $+ >				$: < $2 > < $(verifier_helper $1 @ $2 $: $) >
-R< $+ > <  >				$: < $(verifier_helper $1 $: $) >
+R< $+ > <  >				$: < $1 > < $(verifier_helper $1 $: $) >
+R< $+ > <  >				$: < $1 > < $(vbestmx $1 $) >
+R< $+ > < $+ . >			$: < $(verifier_helper "mx:" $2 "" $: $) >
 ifelse(_mode_, `white', `dnl
 dnl if we found nothing in the whitelist, we continue with checking
 R<  >					$@ < cont >