diff --git a/postfix-lookup/lookup.sh b/postfix-lookup/lookup.sh
index 001ce84..fd2ebeb 100644
--- a/postfix-lookup/lookup.sh
+++ b/postfix-lookup/lookup.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-virtual_alias_maps=$(postconf -h virtual_alias_maps | tr ',' '\n')
+virtual_alias_maps=$(postconf -h smtpd_sender_login_maps)
 alias_to_lookup="$1"
 result=$(echo "$virtual_alias_maps" | xargs -I {} postmap -q "$alias_to_lookup" {})
 echo "result=$result"