sa-exim with SA and mysql.

Hello I just installed sa-exim and I am trying to get
it to work with 
spamassassian using mysql.  I am running exim4 with
cyrus imap and have 
virtual users so I want to store their whitelist in
mysql.  Everything 
works accpet it seems when I use sa-exim all mail
going to spamassassin 
looks like it is coming from the debian-exim user
instead of the 
user who is in the from field.  Is this how it was
designed?  Is there 
anyway I can change this so that all mail passed to
spamc will look like 
it is coming from the from address?  Thanks so much.

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