Question : Exchange 2007 Send/Receive Problem

Switched over from a DSL connection to a T1, everything was fine.
For some reason after the change our Exchange server can receive emails but can't send emails. Any ideas as to what I need to check?

Thanks,

Answer : Exchange 2007 Send/Receive Problem

Go here
www.testexchangeconnectivity.com/

Test for inbound email.
Post back errors here.

thanks