Index: wp-includes/class-pop3.php
===================================================================
--- wp-includes/class-pop3.php	(revision 10465)
+++ wp-includes/class-pop3.php	(working copy)
@@ -628,7 +628,8 @@
         for($count =0; $count < $length; $count++)
         {
             $digit = substr($server_text,$count,1);
-            if(!empty($digit))             {
+            if( ($digit != '') and ($digit != chr(0)) )
+            {
                 if( (!$outside) && ($digit != '<') && ($digit != '>') )
                 {
                     $banner .= $digit;