I have a windows 2012 server running exchange 2013. Within the last couple of months it would randomly stop passing email. There would be not mail flow at all. i would check the services and they would all be running and there would be nothing in the event view to show anything was wrong. Restarting the server didn't change anything. we found that if we disabled the NIC card and enabled it that mail flow would work. The server has 4 NIC slot on it. We change to every one of them thinking that it was the NIC that was causing the problem. But we go the same results on all four. we then install a new NIC card thing that it may be the on board network chip set, still the same problem. Also even though the mail flow stops we can still access the server through remote desktop and still get to the internet from the server. so with all of this said it has to be something in exchange that stopping or is corrupted and not causing a error to show. Has anyone seen or had this problem that can help me resolve it. Thanks
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