Assuming you've configured email in osTicket correctly and have it working, you'd need to disable/enable these options in the settings:Admin Panel > Settings > AutoresponderandAdmin Panel > Settings > Alerts & NoticesRegarding email setup (in case you have not yet done that), take a look here:http://osticket.com/wiki/Email_settingshttp://osticket.com/wiki/POP3/IMAP_Setting_Guidehttp://osticket.com/wiki/Email_Piping