itsupport-54,
Do you have access to the System Administration and Diagnostics software? If so then just have it connect to the system, hit the play button and then look at the System Information box and click on the logs button.
Inside of the pop-up for the logs you will find some mail logs. Those logs will tell you what the system is doing with SMTP and what errors, if any, it is receiving.
Thanks,
TE