W32/Zhelatin.gen!eml is a virus that sends spammed email messages used to entice users into visiting sites hosting exploits that would result in a drive-by download.

A user receives an email titled “You’re received a postcard” in his inbox and is requested to open the link contained in the message body in order to view the virtual postcard. On visiting the link, a cocktail of browser and application exploits that attempts a drive-by install of malware on the users machine is performed.

More information can be found at this McAfee page.