Hello,
Just installed 2013 excahnge server 3 days ago. We noticed after the first night that we did not receive any external emails throughout the night. I could not find anything wrong with receive connectors. Telnet works internally when this happens but NO access from public side testing with telnet. After I reboot the exchange server everything functions just fine and normal for about 8 hours until it happens again.
I dont know what to check or look for at this point. Very new to exchange 2013. Any kind of advice would be helpful at this time.
It is not a firewall issue. Same firewall and set of rules that we use for other/old mail servers. We only have 1 exchange server that has all roles.
Lead Pusher