This one has been doing the rounds locally so thought that it was worth passing on.  

Checked SNOPES and it is genuine - see http://www.snopes.com/computer/virus/postcard.asp

Hamish

         Get this  E-mail message sent around to your contacts ASAP.

         PLEASE FORWARD  THIS WARNING AMONG FRIENDS, FAMILY AND CONTACTS!

        You should be alert during the next few days.  Do not open any message with an attachment entitled "You have received a POSTCARD from a family member," regardless of who sent it to you.  It is a virus which opens A POSTCARD IMAGE, which 'burns' the whole hard disc C of your computer. This virus will be received from someone who has your e-mail address in his/her contact list.  This is the reason why you need to send this e-mail to all your contacts.  It is better to receive this message 25 times than to receive the virus and open it.

        If you receive a mail called" POSTCARD," even though sent to you by a friend, do not open it! Shut down your computer  immediately.

        This is the worst virus announced by CNN. It has been classified by Microsoft as the most destructive virus ever.  This virus was discovered by McAfee yesterday, and there is no repair yet for this kind of virus.  This virus simply destroys the Zero Sector of the Hard Disc, where the vital information is kept.

        COPY THIS E-MAIL, AND SEND IT TO YOUR FRIENDS. REMEMBER: IF YOU SEND IT TO THEM, YOU WILL BENEFIT ALL OF  US.

  No virus found in this incoming message.
  Checked by AVG Free Edition.
  Version: 7.5.516 / Virus Database: 269.21.5/1314 - Release Date: 3/5/2008 6:38 PM

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  Get the name you always wanted with the new y7mail email address.

  No virus found in this incoming message.
  Checked by AVG.
  Version: 7.5.518 / Virus Database: 269.21.6/1318 - Release Date: 3/7/2008 2:01 PM

  No virus found in this outgoing message.
  Checked by AVG.
  Version: 7.5.518 / Virus Database: 269.21.6/1318 - Release Date: 3/7/2008 2:01 PM

  ____________________________________________
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No virus found in this incoming message.
Checked by AVG.
Version: 7.5.518 / Virus Database: 269.21.7/1324 - Release Date: 10/03/2008 19:27

No virus found in this incoming message.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.21.7/1330 - Release Date: 15/03/2008 14:36

No virus found in this outgoing message.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.21.7/1330 - Release Date: 15/03/2008 14:36