Email address keep sending out random emails to my contacts?

How and why are this emails sent to me and my contacts?

• Over the past months, that was March, i have been recieving junk mails concerning work online at home and i have never had a single day going on without having a querrel with at least one of my contacts asking why did i have to send them those 419 websites, Which really i never did. Yesterday, i couldnt bear it when one of my contacts still conplained that he has received those mails from me twice, that i want to extort money from him. I was mad like hell and even could not sleep because after the efforts i put on telling i dont how and who is using my yahoo ID and email to send those mails, that i myself have received them also from other people but just deleted them each time i come across them. I know is fake if not the rate of unemployment will not be alarming in the UK and when you try to open it they ask your name and email, then even if you dont subscribe they keep on sending you junks again in your INBOX about study online programs, Ipod and Blackberry phones online for sale, many testimonies about people who have successfully earned lots of money that way etc I asked myy junior brother the same thing, and he told me he never sent them to me but i was the one who did. Last Friday, i got a post claiming i ordered a chemical online to purify drinking water worth 39krone which i never did, i have even never ordered anything online. What also terriffied me here is how did they get my full names as well as address to do all this. If you dont know the reason, please dont answer because this way getting out of hand. Thankks in advance. Have you received such emails or we are the only ones in this scandal.

• Answer:

  Change your password. Read about email spoofing: http://en.wikipedia.org/wiki/Email_spoofing