diff -ruN e-smith-email-5.2.0.old/root/usr/local/sbin/smtp-auth-proxy.pl e-smith-email-5.2.0/root/usr/local/sbin/smtp-auth-proxy.pl
--- e-smith-email-5.2.0.old/root/usr/local/sbin/smtp-auth-proxy.pl	2012-03-05 01:20:39.000000000 +0000
+++ e-smith-email-5.2.0/root/usr/local/sbin/smtp-auth-proxy.pl	2012-03-05 01:28:14.000000000 +0000
@@ -28,6 +28,7 @@
     $prop->{Debug} = $smtp_proxy_rec->prop('Debug');
     $prop->{SystemName} = $config->get_value('SystemName');
     $prop->{DomainName} = $config->get_value('DomainName');
+    $prop->{MD5Patch} = $smtp_proxy_rec->prop('MD5Patch') || "disabled";
     $prop->{PeerPort} = $smtp_proxy_rec->prop('PeerPort') || 25;
     $prop->{Helo} = $config->get('smtpd')->prop('HeloHost') ||
         "$prop->{SystemName}.$prop->{DomainName}";
@@ -92,6 +93,10 @@
 
     if ($smtp->supports("AUTH"))
     {
+    	if ( $self->get_property('MD5Patch') eq "enabled" )
+    	{
+    		${*$smtp}{'net_smtp_esmtp'}->{"AUTH"} = "PLAIN LOGIN";    
+    	}
         unless ($smtp->auth($name, $pass))
         {
             print "451 Could not auth to mail server\n";