Thanks ntozier and sorry, my english is not good so may be you couldn't understand my problem.osTicket Version: v1.9.8.1 (4752178)Web Server Software: Apache/2.4.12 (Win32) OpenSSL/1.0.1l PHP/5.6.8MySQL Version: 5.1.33PHP Version: 5.6.8OS: Windows 7I use gmail server to send an fetch emails. If when I create a ticket (with "Send alert to user" checked), or reply a ticket, would some failure in gmail server authentication, the ticket shown as "Ticket created successfully", but the email is not sent to recipient (assuming a possible error in the authentication). In that case, how can I know that the email was not sent to the recipient?Thanks...