I have a client that sends out an email blast once a week to 10K addresses. They use a desktop mass emailing program. This process used to work fine on their previous Exchange 2003 server. Now that they have upgraded to Exchange 2010, it takes over 45 minutes to run.
I setup a receive connector to allow the program to relay. I checked the limits on the organization as well as the receive connector and there are none specified.
I ran the powershell commands in this article but they had no effect.
Is there something else within Exchange that would be slowing down or rate limiting this blast?