Overnight on 20/21 January, all my email accounts in Mail on my MacBook Pro suddenly stopped working. Kept asking for me to verify the passwords, which I did repeatedly, only to get the error message each time that the email or password could not be verified. I tried deleting one of the accounts and reinstalling it, but again got the error message that the email or password could not be verified.
WebMail works, as does the app on my Android device.
My wife's email is no longer working on her iPad either.
Have tried looking on Apple Forums, but no clues there either.