I am using "Use DNS to Route email" on our SBS exchange and random SMTP connectors, for the domain the emails are being sent to, were created in the queue of Exchange and ALL the emails are in "retry" state.
I then tried to switch the outgoing server to our ISP's SMTP server. Then they would bounce back immediately. So i called my ISP and they said they dont require you to use their SMTP server and they dont block any ports?? I never had this issue before and im at a stand still.