Retour spam à un message envoyé à un contact

Bonjour,

Lorsque j'envoie un email à un de mes contacts msn en particulier ce dernier lit bien mon message mais me renvoie un spam:
"Dear friend:
I recommend to you a very good shopping site << www.nommodifie.com >>.
The main products: motorcycle, television, laptops, digital cameras, phones, etc.
The quality of product is had better, the service is perfect, and price is had better, the speed of the deliver is very fast.There are own warehouse and store,, receive customer very high praise. if you have the confidence to buy, please contact them as soon as possible,


Email: nommodifie@yahoo.com.cn
MSN: nommodifie@hotmail.com
Wish we cooperation delectation !

__________________________
j'ai modifié le nom du site;

Que doit faire mon contact s'il vous plait ?