[Mailman-Users] I need to get "Sender:" address

[Rob Jackson]

I have messages coming from a Gatewayed Message board to mailman.  There is
an extra field To: field and a Sender: field and I need to get the Sender
e-mail address.
 
I have tried modifying the SENDER_HEADERS to
('sender','from',None,'reply-to'), so sender is before from, but it still
grabs the "From" even if "Sender exists."
 
-Rob