Apple mail Reset to Default
Having run Disk Clean Pro AppleMail seems to have reset to default. There are no mailboxes and no mail or accounts and I am unable to create an account as the + and - buttons are greyed out regardless of which 'Account' I try and select. Preferences too is greyed out. Any clues how to restore previous settings. I have Time Machine back ups and have Mailboxes exported and can receive e ail on other devices.
Thanks
Chris
iMac 27″, macOS 10.15