I have recently switched our school email over to office 365 everything has gone smoothly. But I have redirected our mail URL (mail.schoolname.sch.uk) to point to office 365. At home works fine. But in school when people try hit the URL it just hangs. I'm guessing it could be some issue with the old emaili domain being stored in the cache or something.
Anyone any ideas how to get it to work? And actually redirect to the new URL?