If you are using another email account, you can still send email that appears to come from your McCombs email address. If you have graduated, you will need to have your email forwarding set up.
Read about how to enable your Gmail account to send from another address in the Gmail Help Files.
http://mail.google.com/support/bin/answer.py?hl=en&answer=22370
Read about how to enable your Yahoo account to send from another address in the Yahoo Help Files.
http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-01.html