I forgot to mention in the problem description that I'm using a win32 box.

I'm aware that some mailers offer some form of threading but haven't come across one that can do it well across digests like described above (am currently using MS Outlook 2000 at the moment).

A small standalone perl script to solve the problem seems much more attractive than a multi-Mb MS Outlook 2000 installation + all it entails!)

dmtelf