It is possible, however, for some kinds of executable code in a file
attachment to execute automatically upon receipt.  Some email software
can recognize document types and then launch an appropriate application
to load the document.  If the document is a type that can contain
executable code (MS Word files with programs written in Word's macro
language are a notorious example), then it is indeed possible for a
virus or trojan to load and execute automatically.  It all just depends
on what software you are using and how you have it set up.  
Ian Goddard wrote:
>  At 02:27 PM 10/31/96 +0000, jamesr@best.com wrote:
>  > You can't get a virus by reading your mail, even if there
>  > is a virus attached.  The technology doesn't work that way.
> 
> IAN: What about a file attached to an email ?  These files are loaded
> onto my hardrive like any file, and a virus, as I understand, is basicaly
> an exe file. As far as I can see, one of those attached files can be an
> exe virus file. How is this not so?
-- 
                              Peace,
                              William Kitchen
                              bill@iglobal.net