Yahoo Error 999 Can't Open Email

The person who posted this question about Yahoo did not include a detailed explanation. Please use the "Request More Information" button to the right if more details would help you to answer this question.

I Know the Answer!

I have the same question
Request More Information

Current Answers

There are currently no answers that have been posted for this question.
Be the first to post an answer!

Remember that you can earn up to 1,100 points for every answer you submit. The better the quality of your answer, the better chance it has to be accepted.

Yahoo Knowledge Base Results

We have determined that the information below may contain an answer to this question. If you find an answer, please remember to return to this page and add it here using the "I KNOW THE ANSWER!" button above. It's that easy to earn points!

How do I update my Secret Question? | Yahoo! Mail Classic Help
... or mobile phone associated with your account No longer have access to the alternate email address or mobile phone associated with a second level of the problem, including steps to replicate the error and any error messages you lose access to your Security Question if you can 't verify the Answer to verify your Yahoo...
Why am I receiving an error when I send mail from Outlook, Thunderbird, Mac Mail, etc.? | Account Information Help
... See the new account in the list on the page and Paste that opens, check to generate the email we will see when they get email from the new address: Leave this ) and click Continue Look now: ...! People receiving the message will send to make sure you 're done. Why am I receiving an error when I send mail from within Yahoo! If you there.) Click On the page that confirmation code in ...
What Yahoo! Toolbar Options are there? | Toolbar 8 Help
... accessing private content such as email and stock portfolios. Enable the 404 Assistant: Controls whether Yahoo! ID. homepage: Controls whether Apps added to those open Yahoo! homepage after you enable...sites you visit: Controls whether you with Yahoo!, to your browsing history with 404 page errors. assists you share your toolbar. If you add to sign in the same browser ...