Seems my keychain is lost (I blame this on FileVault). My mail application (as well as anything else that needs a password) can no long find passwords. So I add my password, and I get a dialog box saying "keychain 'mykeychain' cannot be found to store 'myname'". So I click reset to defaults. I then get another box saying "are you sure you want to reset keychain environment to the default?". I click yes, then add my login password to the next window. So now things work, but if I close the application (in this case mail), I then have to redo the entire adding of the password.
Any help much appreciated.