[imp] IMP + spamassassin

[matt .]

Hey folks,

I use IMP with amavisd-new and spamassassin.  My problem is, spamassassin is
working too well.  IMP is webmail, so it makes sense users are accessing it
from their home Internet accounts, however, when I send an email using IMP
from my home cable internet, it gets blocked as spam from spamassassin
because the originating IP is in my Cable Internet providers IP block.

Is there any way to configure IMP to send as the IP of the host it's
installed on?  Thanks.

Kind regards,

Matt