[Mimedefang] tagging mail sent to aliases

[Gary Funck]

I notice a lot of spam gets sent to one of a number of mail aliases, which
we've added to /etc/aliases to catch alternate spellings of our e-mail
addresses.  Is there a method within sendmail to notice when it has mode
an alias substituion, and to then have MdF add a header tag noting this
happened?  If it can do that, then it'd be easy to write a custom rule
that dings the usage of alternate spellings.