I have been using this phone for long and I always receive mails from yahoo through the mail button but since last week, my yahoomail don't retrieve mail but the gmail does retrieve mail. I logged in through safari and discovered I had about 20 yahoo messages.

Is something wrong with my phone or is it a general problem?

I tried verifying my account and it keeps reading "The IMAP server 'apple.imap.mail.yahoo.com' is not responding, enter the correct information in 'incoming server field'".

Gurus in the house, please how do I resolve this?