Emails have stopped

Hi, had my IPad 2 for nine months and have always been able to quickly access my emails via the icon on the first page when switching on, noticed that no new emails have arrived for the past 7 days. I have to laboriously log on to my service provider to see my latest emails. A pop-up box says I am not connected and asks me to go to imap.tools.sky.com but no help, can anyone help?

Montagu73