Log all calls to wp_mail() to a file wp-content/plugins/wp-mail-log/wp-mail-log.txt for debugging. Delete this file afterwards. Please be advised, this file is probably publicly accessible on your server, and could well contain private information. This plugin is for debugging purposes only, I encourage you to delete the log file and deactivate the plugin once you’re finished with it. You can view the file using the WordPress plugin editor. It will appear in the same folder as this plugin. Support Questions If you have a question, please read the code. Failing that, you can try here: http://www.callum-macdonald.com/code/wp-mail-log/