Someone is using my email address and sending virus emails how can I stop this happening?

Someone has hijacked my address book and is sending virus infected mail using my email address to other people in my address book. How do I get rid of this hacker from my Mac, and how do I prevent this happening again.

Your mail account has almost certainly been hacked on the server, not on your computer, unless someone has had access to the latter.
Log in to the mail server's web interface and change the password. If you use the same password for any other accounts, change those passwords too, and make them all different. Internet passwords should be random strings of at least 10 characters. You most likely don't need to, and should not be able to, remember them. They should be saved in your keychain and backed up with the rest of your data.
One way to generate a secure password is the following. Triple-click anywhere the line below to select it:
openssl rand -base64 10 | cut -c-14 | open -f -a TextEdit
Copy the selected line to the clipboard (command-C). Launch the Terminal application and paste into the window that opens (command-V). A string of 14 random characters will appear in a TextEdit window. Use that string, or a substring, as the password. To generate another random string, press the up-arrow key and then the return key with the Terminal window active. You can then quit Terminal.
If the compromised account is on Gmail, then changing the password may not be enough. Follow all of Google'sinstructions to secure it.

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