Thanks for your reply, Mike!
The server owners say that they don't have Procmail but they do have Sendmail.
Okay, the question you need to ask them is this: Is it possible/allowed for you to "pipe" or otherwise "forward" incoming email to a CGI script via an email "alias"?
Under sendmail with no .procmailrc support, your administrator might need to manually enter your aliases/forwards in the file
/etc/aliases, such as follows:
bounce@site.com: "| /usr/bin/perl /home/site/cgi-bin/bounce.cgi"
.procmailrc is basically a powerful way for you to set up your own aliases/forwarders.
Regards