The configuration of the email settings appear to all be in order, the changes get accepted and saved. I can send mail from OSTickets. I've tried sending an email to the OSTickets inbox internally, we have a bunch of stuff in the signature so I tried sending one from my personal email with no signature and no tickets have been created.OSTickets is running on a Ubuntu-16-04 VM with PHP v5.6 with Apache2The mail server is Exchange 2010I am using IMAP for the fetchingIMAP has been configured on the serverNot sure if it matters but some of the configuration of IMAP on the exchange server is as follows.IP address of OSTickets is added to the IMAP4 properties list.Authentication is currently plain text logon with no TLSConnection settings are all the default using port 143Retrieval settings for MIME is Best body formatThere are no logs in the system logs within OSTickets and I have it set to debug mode for the moment.There are no new error logs being generated in error.log or access.logI've restarted apache and the VM itself after making changes and testing the settings in OSTickets, which get accepted.If any other information is needed please let me know.