That does match the help page.

by R. Proffitt Moderator - 10/11/12 4:45 PM

In Reply to: This is whats happening by gorilita

http://email.about.com/od/yahoomailtips/qt/Access_Your_Yahoo_Mail_Account_with_Your_Email_Program.htm

But did you see if your DNS (I didn't find that detail in your post) resolves that name?

Did Live get the first 5000 Emails? If so, I will have to abandon you to Microsoft's care.
Bob