Getting postfix to "de-alias" before passing to a filter

[This originally went to the dspam list...the postfix list is next, I think.
We're setting up postfix and dspam on our system, and I am looking for a way
to make sure all the mail goes through the filter with a "real" user name.
More detail below."

OK...I've read all the documentation I can find, and searched the dspam user
archives. Still no answer. I did find one reference to the problem I was
having here: http://dspam.nuclearelephant.com/dspam-users/0707.html but that
still didn't answer my question.

On our mail system, we have a few "small scale" mailing lists that we handle
via aliases. These are mostly things like a staff account that goes to all
users, etc. When these messages pass through dspam, it is using
staff@domain.com as the user name (we have virtual users enabled). This
means that mail coming through staff@ is not being weighed against the
individual users (i.e. it is training the staff@ profile, instead of the
individual users).

Is there a simple way to tell postfix to "de alias" the mail before it passes
it to dspam? Yes, this means a message could get scanned N times (where N is
the number of users the alias expands to) but we don't have enough volume for
that to be an issue.

And no, using dspam as the delivery agent won't work, because several of our
addresses are forwarded off the box (via an entry in the postfix virtual
table) so the mail never reaches the delivery agent.

Any tips would be greatly appreciated!

j

-- 
Joshua Kugler                           
Lead System Admin -- Senior Programmer
http://www.eeinternet.com
PGP Key: http://pgp.mit.edu/  ID 0xDB26D7CE
PO Box 80086 -- Fairbanks, AK 99708 -- Ph: 907-456-5581 Fax: 907-456-3111
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