Spam emails sent from my address book

[sjtjc]

I am being told by people in my address book that they are receiving emails that look as if they're from me but I've never sent them. All of the emails encourage the recipient to click on a link.  The emails also have a signature that it was sent from Verizon Mobile.  How can I stop this?

[somegirl]

Change you password and secret question and run a virus scan.

[sirlordford]

I don't think it's a hack but a spoof.   I am having the same problem.  Will try the password and question change but if that doesn't work, any other ideas?