Index: wp-admin/import/mt.php
===================================================================
--- wp-admin/import/mt.php	(revision 5700)
+++ wp-admin/import/mt.php	(working copy)
@@ -365,8 +365,6 @@
 				$email = trim( substr($line, strlen("EMAIL:")) );
 				if ( 'comment' == $context )
 					$comment->comment_author_email = $email;
-				else
-					$ping->comment_author_email = $email;
 			} else if ( 0 === strpos($line, "IP:") ) {
 				$ip = trim( substr($line, strlen("IP:")) );
 				if ( 'comment' == $context )