Can't access Yahoo account on iphone- says 'IMAP server"apple.imap.mail.yahoo.com" isn't working' My yahoo account has stopped working on my iphone 4s.
I can access the account on a desktop but not the iphone.
Comes up with 'The IMAP server "apple.imap.mail.yahoo.com" is not responding. Check your network connection and that you entered the correct information in the "incoming Mail Server' field.'

Any idea how to fix this? Hasn't happened before.
The incoming IMAP server you are getting ("IMAP.apple.mail.yahoo.com") is not a real Yahoo IMAP server. Like @Buscar said, deleting and re-adding should resolve the problem. However, it seems like the settings are getting recreating incorrectly.

What I'd do, after re-adding the email, is manually fix the settings to the right servers. To fix them, go to Settings > Mail, Contacts &amp; Calendars > (select Yahoo account) > Account. You should have the option to edit the IMAP server in the Advanced section.

If it doesn't allow you to change it, add the account manually by going to Settings > Mail, Contacts, Calendars > Add Account > Other. You can fill in the information found here: https://help.yahoo.com/kb/mobile-mail/imap-server-settings-sln4075.html