diff -ruN qpsmtpd-0.83.old/plugins/require_resolvable_fromhost qpsmtpd-0.83/plugins/require_resolvable_fromhost
--- qpsmtpd-0.83.old/plugins/require_resolvable_fromhost	2009-09-22 11:49:27.000000000 +0100
+++ qpsmtpd-0.83/plugins/require_resolvable_fromhost	2012-06-30 16:59:04.000000000 +0100
@@ -48,7 +48,7 @@
 
   return 1 if $host =~ m/^\[(\d{1,3}\.){3}\d{1,3}\]$/;
 
-  my $res = new Net::DNS::Resolver;
+  my $res = new Net::DNS::Resolver(dnsrch => 0);
   $res->tcp_timeout(30);
   $res->udp_timeout(30);
   my @mx = mx($res, $host);
@@ -106,7 +106,7 @@
 
 sub mx_valid {
   my ($self, $name, $host) = @_;
-  my $res   = new Net::DNS::Resolver;
+  my $res = new Net::DNS::Resolver(dnsrch => 0);
   # IP in MX
   return is_valid($name) if ip_is_ipv4($name) or ip_is_ipv6($name);