A spam gourmet subscriber Ofer Hadas directed me to your site - love it and the plain talk informative tone.
I have an anti-phishing solution (in the public domain) called VARA - which uses delimiters in the user portion of the RCPT address.
http://wiki.OutboundIndex.net/VarA
It occurs to me that the spam gourmet code probably already does much of the same parsing that I will need, although my application calls for a PTR and forward DNS lookup which spam gourmet probably does not.
Anyway - I would be interested in your comments on delimiters as that has been the hottest debate so far about VARA. I would like to use underscore.
We have a C milter and a python milter for another purpose to which we will be adding VARA support. However it seems it would be easy to do the simple VARA stuff in perl for a start, esp since it takes time and sometimes DVDs / wine / pizza to get C and python programmers motivated.
Thank you,
- April