The best way to resolve this is to delete the account then re-add it. The incoming server settings should be: mail.bellsouth.net; Alternate settingsop.att.yahoo.com port 995; Alternate settings:imap.n.mail.yahoo.com port 143. The outgoing server settings should be: mail.bellsouth.net; Alternate settings smtp.att.yahoo.com port 465; Alternate settings smtp.mobile.mail.yahoo.com port 587. Once you have verified these settings it should work properly. Hope this helps.