Hello Andrew,
Currently, there is no way to have the subject add to the delivery logs.
One option would be to add a spool script.
Command Line File - Move the slider to the right to enable this option. Then enter the full path to an executable you wish to use to process incoming messages. Use %filepath as an argument to pass the path of the email file to the executable. It is allowable for the executable to delete the message to prevent delivery. Example: If you set this field to "c:\program files\myexe.exe %filepath", the program myexe.exe will be launched with the full path to the spool file as its first argument.
Command-Line Timeout (Seconds) - The number of seconds that the server will wait for information from the remote server. By default, the timeout is set to 5 seconds.
The way this works is that the .eml path is passed to the script you write up. What you can then do is to read the file and record the EML number and the Subject to compare in the logs. The last 8 digits of the EML number are the session number as well.
I hope this helps.
Thank you
Tony Scholz
System/Network Administrator
SmarterTools Inc.
(877) 357-6278
www.smartertools.com