I have two sites both on Exchange 2010, both on Windows 2012 R2. I've attached a screenshot of what I am seeing in the queues from Site B to Site A. Port 25 is definitely open. I can telnet. I have restarted both servers. So I don't understand what on earth is going on and why these queues are occurring.
I read that it could be self signed SSL related? So I've tried re-applying the SMTP service to the current certificate and restarted the Transport services, but still these queues remain.
Any help would be greatly appreciated guys,
Thanks for helping