Update: AT&T Yahoo Mail Problem
After reading today's posts, I tried again to add my Yahoo account (a free account) back to BIS. This time it validated the account. Sent the service books and then a test email from another account. The test arrived almost instantly.
Perhaps the fix for whatever the problem was on Yahoo's side is just taking awhile to replicate to all mail servers - so keep trying periodically to add the account back to BIS.
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