Passing RCPT_TO value to procmail

When giving out my email address to corporate websites likely to sell my
email address, I typically use the form:

        <corporation>_tracer@<domain>

Where <corporation> is the name of the company I'm giving my email address
to, and <domain> is my domain name where all email ends up in the same
mailbox.

Unforunately, spammers rarely include the actual To: address in their
emails -- is it possible to pass the RCPT_TO line from the SMTP
session from Sendmail to Procmail so that I can capture who has put me on
a list?

I would be forever indebted to get the answer.

Thanks,
Bram Kivenko

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