"Apple.imap.mail.yahoo.co" is not responding. Check your network connection and that you entered the correct information in the "incoming mail server" field. Works on office wifi, not the wifi at home. Any ideas?

"Apple.imap.mail.yahoo.co" is not responding. Check your network connection and that you entered the correct information in the "incoming mail server" field. I have the same problem on my gmail account. Works on my wifi at office as normal, but added Frontier net rent wifi at home and this is the error I receive. I have even deleted the account and had the iPad add it as a new email account, and it still doesn't work at home. Any solutions?