email with imap settings since today (4 august 2016)

email with imap settings since today (4 august 2016)

Hi
since today the emails are not working. 
When setting up the imap settings it says "authenticating" for a few minutes and then gives an error "server disconnect"
it has been working until this morning... I have tried on several browsers and have alsy "disconnected imap" and tried to enter everything again .. but it gives the same result every time.
PLEASE HELP URGENTLY!

thank you