Assembling log entries for each SMTP session

[Nikolaos Milas]

Hello,

A quick question: Can you please suggest a software tool which quickly 
"restructures" postfix mail log in a way that lines pertinent to each 
and every SMTP session are assembled and kept together.

We need this because, otherwise, identifying and analyzing particular 
sessions by assembling all pertinent scattered log lines is tedious, 
unproductive and may miss important log lines which could be important 
in troubleshooting issues.

You may have answered this more than once in the past but my research 
did not produce the results I would hope, so please bear with me.

Thanks,
Nick