Index: wp-mail.php
===================================================================
--- wp-mail.php	(revision 6226)
+++ wp-mail.php	(working copy)
@@ -60,10 +60,14 @@
 				$subject = $subject[0];
 			}
 
-			// Set the author using the email address (To or Reply-To, the last used)
+			// Set the author using the email address (From or Reply-To, the last used)
 			// otherwise use the site admin
 			if ( preg_match('/(From|Reply-To): /', $line) )  {
-				$author = sanitize_email(preg_replace('/(From|Reply-To): /', '', $line));
+				if ( preg_match('|[a-z0-9_.-]+@[a-z0-9_.-]+(?!.*<)|i', $line, $matches) )
+					$author = $matches[0];
+				else
+					$author = trim($line);
+				$author = sanitize_email($author);
 				if ( is_email($author) ) {
 					echo "Author = {$author} <p>";
 					$author = $wpdb->escape($author);