How do I stop someone else from using my email address fraudulently?

Someone is sending emails using my email address; how can I investigate and stop them?

• Several fake emails have been sent to one of my business acquaintances over the past 6 weeks. At first he ignored them, but today he called me to alert me to what was going on. He said that he didn't open them because the introduction/comment looked strange and suspicious. Now I am worried about how many other people are getting emails claiming to be from me and if they carry a virus. How can I investigate this and most important of all HOW CAN I STOP THIS FROM CONTINUING??

• Answer:

  This was probably caused by someone obtaining your ID and password and copying all your contacts or a friends ID and password and copying their contacts. From that point on they do not need either account. Anyone with a separate email program can use any address as the FROM address. There is no way to stop this method. They can continue even if the account is closed. They already have the list. To make sure they are not actually in your account you can change your password. This is not normally caused by a virus. In the rare case where it is then the virus is in your computer and not at the Yahoo mail website. Changing your account may not solve the problem since any virus is going to get access to your new account too. ʎəɿʞɹɐq  ̊ ͜͡● ̊