We have a new Exchange 2013sp1 system with a single DAG serviced by two servers. Both servers participate in the Internet send connector. In the delivery reports we see the 02 server hand off to the 03 server and then the message goes outbound to the internet.
We have a spam a/v solution that is the Smart Host on the outbound too. Once it gets an outbound message delivery occurs in seconds. But getting the message from the Transport Service on one or the other Exchange 2013 server takes minutes.
We tried to create two Internet send connectors separately servicing each Exch. 13 server. Still VERY slow on delivery.
In earlier versions of Exch. we had routing groups (2007, 2010) that combined hub transport roles together. From what I read here: http://technet.microsoft.com/en-us/library/aa998825%28v=exchg.150%29.aspx
HT role is now transport role and mailbox transport role.
We just tried a test whereby each Internet send connector was changed to MX to go directly outbound.
Any ideas or powershell commands we can use to try and figure out why our transport service(s) are so slow?