Many greeting card messages sent via email are simply a ploy to get users to either download and install an infected computer file or to visit a site where the user will receive a virus.
Lately there has been a message going around similar to the following:
You have received an eCard
To pick up your eCard, choose from any of the following options:
Click on the following link (or copy & paste it into your web browser):
Your card will be aviailable for pick-up beginning for the next 30 days.
Please be sure to view your eCard before the days are up!
We hope you enjoy you eCard.
Please delete this message immediately. Do not follow any of the links within the message, and always avoid any message with a link to an .exe file or any other type of attachment.