Is there anyway to troubleshoot mail delay problems?  I'm running 2007 and 2013 in co-existance.  However, I have stopped the transport service on 2007.  Mail flow works fine at times.  However, at other times there is up to a 20 minute delay in receiving.  Is there a way to troubleshoot this issue?

Thank you

Hi There,

Probably looking into intraorgprotocol logs will help you for sure 
Run below command to see if the intraorgprotocollogginglevel is enabled or disabled

Get-Transportservice  mbx2013servername |fl*intra*
Run the below command to enable verbose logging in intraorg connector

Set-Transportservice  CAS2013servername  intraorgprotocollogginglevel verbose

Below path is the location where we can see the logs recorded.

<installationdrive\Program Files\Microsoft\Exchange Server\V15\TransportRoles\Logs\Mailbox\Connectivity
After enabling them send an email from Exchange 2007 server and see the output of the results

Test email sent from Exchange 2007 user to Exchange 2013 user and vice versa for the logs to record

Apart from the above look into the queue viewer in Exchange 2007 server and do a message tracking and see the r

Hi redman,

Have you tried the suggestion above? How about the result?

Best regards,

Hi ,

In addition to sathish suggestions , please analyze the headers of the delayed email there you can find delay between the hops with the help of time stamp.