Can't save imap access settings

Can't save imap access settings

Hi,

I've set " IMAP Access disabled " to " IMAP Access enabled " at user detail -> mail accounts, there appear info about changes, but after reloading page, there is set back red " IMAP Access disabled ".

How can I save this settings?

Secondly, I can't access to mailbox via any other aplication, like thunderbird. I've setup everything like in manual.

Domain is verified, MX is set and there are no notifications about errors.