another software query

[Jim Devine <jdevine@xxxxxxxxxxxxxxx>]

almost every day, I get an e-mail (usually from some reputable company --
but once from Michael Perelman) which automatically launches my dial-up
networking applet when I open the message. (I guess they want to help me
download the info they're selling.) I then can't get rid of it, without
shutting Eudora down.

First, this is awfully like a virus -- and I've told amazon.com that.
Second, is there any way to fix Eudora so that it isn't susceptible to
this? I use Eudora 5.0. Thanks ahead of time.
Jim Devine jdevine@xxxxxxx & http://bellarmine.lmu.edu/~JDevine