Nowadays Yahoo mail ids are sending lot of spam mails to email addresses in their contacts. It is been believed that Yahoo server is hacked but Yahoo is not acknowledging it

The Best way to avoid this problem is delete your yahoo account and open a gmail account :)

How to delete a yahoo account?
https://edit.yahoo.com/config/delete_user


If you still love the yahoo mail and wanted to retain it ,then
Change your password and password hints.

Monitor the account activity:
Mail Options-> Account Information->View your recent sign-in activity
If you notice anything unusual then report it to Customer care.

Install good Antivirus in your PC and remove the Malwares.


Use Disposable Email Services like http://www.mailinator.com/

Whenever you are using email id for login to game sites,forums,newsletters and other things,they take a lot of user information and use it to send spams.To avoid such things use a disposable email id.