My osTicket installation is using for its e-mail account connection to IMAP server (MS Exchange) without SSL on port 143 (It's on LAN). It was working OK before, but it has been like two months I started getting these error messages over e-mail:Error: IMAP connection broken (server response)We have tried probably almost everything (even reconfiguring IMAP access on Exchange), but I can't figure out what's going on. Normal e-mail clients (Apple Mail, Thunderbird, Sylpheed) using same access information are working just fine.Did anybody run to this? Any log I should take a look?Thanks.Params:osTicket 1.10 on Fedora 25, Apache, MariaDB, PHP 7