diff -Nur -x '*.orig' -x '*.rej' qpsmtpd-0.96/plugins/helo mezzanine_patched_qpsmtpd-0.96/plugins/helo
--- qpsmtpd-0.96/plugins/helo	2016-02-16 23:52:02.000000000 +0100
+++ mezzanine_patched_qpsmtpd-0.96/plugins/helo	2016-04-15 19:25:32.953870666 +0200
@@ -521,7 +521,8 @@
     my ($dns_name, $helo_name) = @_;
 
     return if !$dns_name;
-    return if split(/\./, $dns_name) < 2;    # not a FQDN
+    my @dots = split(/\./, $dns_name);
+    return if scalar @dots < 2;    # not a FQDN
 
     if ($dns_name eq $helo_name) {
         $self->log(LOGDEBUG, "reverse name match");