With the large number of people saving trees and sending out electronic holiday cards rather than paper ones there is a lot of greeting cards flying through cyberspace.
The spammers know this and are sending out a lot of their own greeting card spam.
An easy way to spot greeting card spam is if the subject and greeting are vague. Legit greeting card emails will list the sender’s name in the subject line and address you by name in the email itself.
Make sure you recognize the sender before you click through and never install anything from these emails.