how to end registration to wsn

This is a multi-part message in MIME format.
--------------F3586CE8D1FF111E4D4606C7

please oh please can someone tell me how to stop receiving these e-mail
thank you.
(very much)

Rafy
--------------F3586CE8D1FF111E4D4606C7
 name="avigad.vcf"
 filename="avigad.vcf"

begin:vcard 
n:Avigad;Rafael
x-mozilla-html:FALSE
url:www.geocities.com/athens/aegean/7512
org:Curtin University of Technology;Psychology
adr:;;Kent St, Bentley;Perth;WA;;Australia
version:2.1
email;internet:Avigad@ses.curtin.edu.au
title:Mr Rafael Eran Avigad
end:vcard

--------------F3586CE8D1FF111E4D4606C7--