"INVITATION" Is A Big No-No

I have just received an advisory that a new and dangerous virus is being spread under the heading "Invitation", and can be spread by infiltration into the email addresses of any contact. If you receive any communication with this heading the advice is to shut down your unit immediately even if the email is ostensibly from a friend. This may of course be a hoax, but I received the warning from a usually reliable source so I'm passing it on. Better safe, etc.,
Joanne