You need to drop the StartTLS in the relay, the 7120 does not support SHA-2 and Exchange 2013 does not support SHA-1. They are completely incompatible.
That is the same reason you can no longer use Gmail or Office365 and the 7120.
You need to drop the StartTLS in the relay, the 7120 does not support SHA-2 and Exchange 2013 does not support SHA-1. They are completely incompatible.
That is the same reason you can no longer use Gmail or Office365 and the 7120.