Where is Mail config stored?

[kave]

I have had huge problems with Mail since 14.1, after reading a mail message it wont be displayed again only new.
I have removed the Mail accounts, removed the Library/Mail folder, the /Library/Preferences/com.apple.mail file etc but all mail config with its errors are kept even after reboot.

Any ideas where to look?

 

[kave]

I answer myself:
I had to delete all folders called "Mail" in /Users/user1/Library/Containers/Mail There where 4 of them called just "Mail".
After that and a add of the accounts it seems like Mail is finally working again.