AT&T bought bellsouth quite awhile ago so you need to go through them to reset the password.
Just use the online password ***** tool here: https://www.att.com/olam/unauth/fpwdEnterUserId.myworld
If you need more information step by step instructions are found here: https://www.att.com/esupport/article.html#!/email-support/KM1009464h
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