I got it working by using. But beware because if you add folders to your imap account they are added to your att.yahoo account that is accessed at http//:att.yahoo.com. This worked for att sbcglobal personal account.Settings ++++++++++++++++++++imapimap.mail.yahoo.com ssl - 993smtp.mail.yahoo.com tls - 587 reply
I got it working by using. But beware because if you add folders to your imap account they are added to your att.yahoo account that is accessed at http//:att.yahoo.com. This worked for att sbcglobal personal account.
Settings ++++++++++++++++++++
imap
imap.mail.yahoo.com ssl - 993
smtp.mail.yahoo.com tls - 587