i have installed a fresh installation of exchange 2016 CU5 on a fresh clean system. also a newly constructed domain forest. so no previous domain garbage.
i followed the regular instructions. prepared the schema and did the install. restarted, configured a send connector and everything worked perfectly without an issue.
suddenly and without a clear reason. exchange just stopped receiving any messages. and when i try to send a message it goes immediately to the drafts.
the firewall gets the messages tries to communicate with exchange but nothing happens. when i open the queue viewer there is nothing there at all. the main submission queue disappears and appears.
beteween the time it was working and the time it stopped working nothing at all has changed. the system is still the same.
the case is really urgent so any help will be appriciated