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Edge Transport Server Troubleshooting

I have an Exchange 2010 organization.  It was upgraded from Exchange 2003 (coexistent mode).  For the last few months everything has been working really well.  3 days ago, the Edge Transport server just stopped working.  The PC itself is fine, but mail flow has completely stopped.  After trying to diagnose the problem via the Exchange Toolbox Mail Flow Troubleshooter I am not given any leads to what might be causing the problem.  The final result from the troubleshooter is a 5.3.3 Unrecognized command error about not being able to send mail.  Not much help...  Desperately needing email flow again, I removed the edge server and have been using the Hub Transport only.  The email flow has returned, but riddled with spam again.

Noteworthy points...
No emails were building up in the Edge Server queue.
Nothing was changed up to or during the system failure.
The Edge Transport server is a Windows 2008 R2 PC located in the DMZ.
The system was working very well before this issue arose.
Recreating the edge subscription did not fix the issue.
All appropriate ports are open and correct firewall policies are in place.
Unbelievably, I've has some cyber-attacks from a disgruntled former contactor we've stopped using.. Possibly even on this machine??

I've read info about this issue happening to others and how there systems were running out of disk space.  As far as I can tell my Edge Server has over 50gig of hard drive space left.  

What would be some troubleshooting steps anyone could recommend to help solve this problem?  The best practices analyzer and mail flow troubleshooter do not lead me to a solution.
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2 Solutions
Did you try some kind of mail tests-> Verify the Transport connectors. -> Adam Partitions and things of this nature? The EDGE is the easiest server to recover. I like to think of it as a sacrifice to the rest of your network. (Think Red shirt cast member in star track with no name). The edge server gives the writers the ability to kill someone off who isnt a main character!!!! My advice. Rebuild the exchange 2010 EDGE install and move on. That said I would look at the Repication od AD data as the most likley issue


Assuming your EDGE in in the external side of your network, you can Use the scripts located C:\Program Files\Microsoft\Exchange Server\V14\Scripts

1. Try Test-EdgeSynchronization - What do you get for results?

2. Restart-Service MSExchangeEdgeSync

3. Try step 1 again - Did the result change?

4.  Check the ports between the Edge and the Internet. Port 25 and 50636 need to be open. Port 25 from the internet to the Edge and port 50636 from the edge to the Hub transport server.

5.  If this fails I would jsut reinstall the Role and set up the Edge sync with the Hub Server and you are done.

I hope this helps.
ND02GAuthor Commented:
Louis.. Thanks for the suggestions.. Here is what solved my problem, and another question directed at your solution.

Ok, well fixing the problem only required me to uninstall and reinstall the SMTP server role on my Windows 2008 R2 server, recreate and resubscribe my edge subscription on my Hub Transport server, revert my firewall policy’s back to their original config (before this problem) and then reboot both Edge and Hub Transport servers.

I originally went to uninstall the Edge Transport server role as you suggested but noticed that removing that role would ultimately uninstall the entire software title.  This is the only role that’s installed on this portion of my exchange environment.  Is there a way to keep Exchange installed with only the Tools role installed while troubleshooting and repairing?  
ND02GAuthor Commented:
Troubleshooting an error that occurred during removal of the Edge Transport role is what helped me determine the SMTP server role was the original culprit
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