When i send an e-mail there is already this advertising-spam-message in the text-field:

"Hey, how are you doing recently? I would like to introduce you a very good company and its website is www.mydosell.com It can offer you all kinds of electronic products that you may be in need,such as laptops ,gps ,TV LCD,cell  phones,ps3,MP3/4,motorcycles and etc........ You can take some time to have a check ,there must be something interesting you 'd like to  purchase . The contact Email:  (removed) MSN:   (removed) Hope you can enjoy yourself in shopping from that company !  Regards"

 - How do I get rid of it?