Above is the funny text I got after I click "activate this plugin". Below is the funny text I got on top of my dashboard if the plugin is activated:
DEBUG postman.php: Postman v1.3.4 starting DEBUG PostmanWpMailBinder: Not binding, plugin is not configured. DEBUG PostmanAdminController: Registering wp_ajax_test_port Ajax handler DEBUG PostmanAdminController: Registering wp_ajax_check_email Ajax handler DEBUG PostmanAdminController: Registering wp_ajax_get_redirect_url Ajax handler DEBUG PostmanAdminController: Registering wp_ajax_send_test_email Ajax handler DEBUG PostmanAdminController: Registering admin menu generateDefaultContent DEBUG PostmanAdminController: Registering test_mail Action Post handler DEBUG PostmanAdminController: Registering purge_data Action Post handler Set-Cookie: PHPSESSID=c01b6d86c803616dd3cfd4ae9598650c; path=/ Expires: Wed, 11 Jan 1984 05:00:00 GMT Cache-Control: no-cache, must-revalidate, max-age=0 Pragma: no-cache X-Frame-Options: SAMEORIGIN Content-Type: text/html; charset=UTF-8