I don't know how true this is, but I have just received the following:
Subject: Real Virus
> I checked with Norton Anti-Virus, and they are gearing up for this
> I checked snopes.com , and it is for
> 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 "POSTCARD," 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.!
> 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.