I think a pretty good rule of thumb is never click on links coming from somebody you don't know.
That being said, I am just getting past the aggravation of my regular email address being hijacked. So many of my friends thought they were getting emails from me but they were all Canadian Drug spam...mostly Viagra and Cialis...and they come in Pink for women!
If an email comes to you and something about it looks odd, do not open it. Best to contact the sender and confirm that they did send it first.
A clue for my friends...I absolutely NEVER pass along an email with earlier forwarding addresses attached.
If you see an address other than yours, it didn't come from me
Unfortunately not everybody in the world has the best intentions and we must be wary...but that won't stop us from having fun!