Please carefully process any e-cards and if you don't see a named sender specified it is unsafe.  Never click on numerical IP addresses found URLs as malware can be automatically downloaded and installed from unsafe sites. Nuwar (aka Storm Worm) is very difficult to clean. 

The wave continues - Subject line variation
http://isc.sans.org/diary.html?storyid=3072

QUOTE: In a followup to our previous story about the e-card exploit, we have received an unconfirmed report from one of our readers that the subject lines have begun to change. At this point in time, the reader has reported us the following variations:

You've received [a|n] [greeting|] [postcard|ecard] from a [admirer|class-mate|colleague|family member|friend|mate|neighbor|neighbour|partner|school friend|school mate|school-mate|worshipper]!