Wrong Instructions on AT&T: Linking an email client to AT&T email

If you use att (att.net at least, maybe bellsouth.net) as your email provider
-- and --
You want to link your email account to a client email application (Outlook, your smartphone)
-- and --
You want to keep a copy of the email on the att server (maybe you share an account with your spouse)
--then--
AT&T has apparently changed how to do the link that account using IMAP, but the company hasn't changed the instructions or notified you on how to do it.

Specifically, the instructions are at:  https://www.att.com/esupport/article.html#!/email-support/KM1086159

The erroneous instruction is:

• For IMAP accounts, enter imap.mail.att.net for the Incoming mail server, and smtp.mail.att.net for the Outgoing mail server.

 If you follow the instructions and get an error about contacting the server that says, in part "*OK[capability IMAP 4rev1ID move namespace x-ID-ACLID", then you have entered the wrong email server information.  (Why such gobble-de-gook for error messages?  I guess the coders think they are all so much smarter than we are.  NOT!  Such coding just wastes everyone's time.)

To be brief, the correct entries for the inbound and smtp server are:

• imap.mail.yahoo.net

• smtp.mail.yahoo.net

att vs yahoo does make a big difference.  

Do this only if you get the error.  Apparently the change is dependent on the client application and even the version of the client application.