You are welcome.
You can try to set up the account manually. In the Mail application, when you click the plus sign to add a new account, hold down the option key while clicking continue. You will need to have all the server and port information for your e-mail provider.
The blunt axe approach.
Do a backup.
Quit Mail.
Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Go to Library/Containers/com.apple.mail. Move the folder com.apple.mail to your desktop. You must move the entire folder, not just the contents.
Re-launch Mail and test. If the problem is solved, recreate any required Mail settings and import any emails you want to save from the folder on the desktop. You can then put the folder in the Trash. If the problem remains, return the folder to where you got it replacing the one that is there.
Information learned from Linc Davis. Thanks to leonie for some information contained in this.