We all know it, but some just cant help themselves and do it any way.
It’s simple,
Don’t open unknown mail attachments.
These things are nasty.
techtarget
If you are running Linux (or Mac) you will be safe 
/MarcusR
As I noted earlier, this isn’t necessarily true. Spyware apps exist for the Mac, and Linux</a](http://sourceforge.net/projects/klamav/">Linux</a)>. You shouldn’t open email attachments no matter what OS you run.