How do I forward an e-mail to someone in my address book?

Someone hacked my email and actually sent someone an email that was in my address book. How?

• They didn't spam them (I know that happens all the time). They actually sent them a personal email as if they were me. When my friend responded, they corresponded with them as if they were me. Normally my emails go through to my phone, but their responses didn't. Also, when I logged into gmail account the only way I could see the emails was in the response of my friend. There were no files in my sent folder. How does this happen???

• Answer:

  You must change your password immediately, least you will have a lot of problems soon! When your e-mail is hacked, they get access to your password, too. To change, try this access: https://edit.yahoo.com/config/change_password