--- qpsmtpd/plugins/uribl.ori	2024-04-28 22:37:31.090000000 -0400
+++ qpsmtpd/plugins/uribl	2024-04-28 22:40:04.111000000 -0400
@@ -102,6 +102,9 @@
 
 use Time::HiRes qw(time);
 use IO::Select;
+use Data::Validate::Domain;
+
+my $v = Data::Validate::Domain->new;
 
 # ccTLDs that allocate domain names within a strict two-level hierarchy,
 # as in *.co.uk
@@ -358,7 +361,7 @@
              [a-zA-Z0-9](?:[a-zA-Z0-9\-]+\.)+       # hostname
              (?:$tlds4regex|[a-zA-Z]{2})            # tld
             )(?!\w)        
-            }gix
+            }gix  && $v->is_domain($1)
               )
         {
             my $host = lc $1;
@@ -400,7 +403,7 @@
 	     [a-zA-Z0-9](?:[a-zA-Z0-9\-]+\.)+       # hostname
 	     (?:$tlds4regex|[a-zA-Z]{2})            # tld
             )(?!\w)
-            }gix
+            }gix && $v->is_domain($1)
               )
         {
             my $host = lc $1;