Spammer used legitimate email address as return (spoofed)

[Hewitt Tech]

An acquaintance sent me an email asking to have her email address changed.
It seems that a spammer used her email address as a return address (I guess
that's sometimes called spoofing) and of course she's getting deluged with
angry responses from the spammer's activities. I pointed her to some of the
anti-spam organization's web sites and told her that it is possible to track
down the people who are trying to benefit from the spammer's advertising and
then sue them but of course this is pretty difficult for any individual. Has
anyone here run into this and if so what did they do about it?

-Alex