fix sending of mail

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@1028930 b8457f37-d9ea-0310-8a92-e5e31aec5664
release 1.5.13

git-svn-id: https://plugins.svn.wordpress.org/events-made-easy/trunk@1028932 b8457f37-d9ea-0310-8a92-e5e31aec5664