Adding my att.yahoo account to Outlook

First, create a Secure Mail Key.

Then in Outlook and use that key wherever Outlook asks for a password.

If you still get errors, use these alternate servers instead of the att.com servers.

IMAP

imap.mail.yahoo.com  (use Port 993 and SSL/TLS)

smtp.mail.yahoo.com  (use Port 465 and SSL/TLS)

POP3

pop.mail.yahoo.com  (use Port 995 and SSL/TLS)

smtp.mail.yahoo.com  (use Port 465 and SSL/TLS)

Thanks I will give it a try.

Still does not connect using the secure mail key. Also i've tried both:

imap.mail.yahoo.com  (use Port 993 and SSL/TLS)

smtp.mail.yahoo.com  (use Port 465 and SSL/TLS)

and 

imap.mail.att.net  (use Port 993 and SSL/TLS)

smtp.mail.att.net (use Port 465 and SSL/TLS)

no success.

What is the full error code that Outlook gives you when it doesn't connect?

Did you create a new SMK or use an existing one?

Can you use your regular password and log into the webmail UI, going to www.currently.com with a browser?