The spam module in the aD ACS had some code that used VERP tags to track bounces and log them in the database. I think this was actually a perl script rather than TCL - and it relied on quickmail, though it could probably be made to work with another mail server too. I guess that code's been ported over to ACS3.2.5 at least. The module was called bulkmail - I don't know if it got ported (it was more of an add on to spam than a separate module) but the documentation for it is still there under /doc/bulkmail.html.
steve
