This article is from the Computer Virus for New Users FAQ, by Nick tanstaafl@pobox.com with numerous contributions by others.
Treat any file attachments that might contain executable code as carefully
as you would any other new files: save the attachment to disk and then check
it with an up-to-date virus scanner before opening the file.
If your E-mail or news software has the ability to automatically execute
JavaScript, Word macros, or other executable code contained in or attached
to a message, I strongly recommend that you disable this feature.
My personal feeling is that if an executable file shows up unexpectedly
attached to an E-mail, you should delete it unless you can positively
verify what it is, who it came from, and why it was sent to you.
The recent outbreak of the Melissa virus was a vivid demonstration of the
need to be extremely careful when you receive E-mail with attached files or
documents. Just because an E-mail appears to come from someone you trust,
this does NOT mean the file is safe or that the supposed sender had anything
to do with it.
 
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