Fixed some notices., updated old code.

git-svn-id: https://plugins.svn.wordpress.org/wp-ses/trunk@862239 b8457f37-d9ea-0310-8a92-e5e31aec5664
Experimental WP Better Email compatibility.

git-svn-id: https://plugins.svn.wordpress.org/wp-ses/trunk@862334 b8457f37-d9ea-0310-8a92-e5e31aec5664