I would change your sbcglobal.net email password, right away (in case it's actually someone else sending those emails [that hijacked your email account {then you will have successfully un-hijacked it by resetting the password}]).
That would depend on the way it was hijacked. A huge number of computers are infected to the point where they act as agents for others. His computer could be sending those emails - and if that is the case simply changing the password may not help.
Install Immunet and run it. It will remove all viruses and malwares from the computer. Go on following link and click on “Get Immunet Free” http://www.immunet.com/free/index.html
"Immunet opts you in to the Ask toolbar and default search engine switch, so users who don't want them should go through the install process carefully. Otherwise, the installation process is straightforward and simple.