From e67f4ff98c31c621b698dbc37b37d94849c8021d Mon Sep 17 00:00:00 2001
From: Matt Simerson <matt@tnpi.net>
Date: Mon, 19 Nov 2012 13:12:48 -0500
Subject: [PATCH] helo: avoid undef warning when rDNS is invalid

specifically, when rDNS returns an invalid FQDN like 'null.', which doesn't have
a domain part.
---
 plugins/helo | 1 +
 1 file changed, 1 insertion(+)

diff --git a/plugins/helo b/plugins/helo
index 1692b4d..8e7d5a2 100644
--- a/plugins/helo
+++ b/plugins/helo
@@ -471,6 +471,7 @@ sub check_name_match {
     my ($dns_name, $helo_name) = @_;
 
     return if ! $dns_name;
+    return if split(/\./, $dns_name) < 2;  # not a FQDN
 
     if ( $dns_name eq $helo_name ) {
         $self->log( LOGDEBUG, "reverse name match" );