in the library.
Perhaps that could be because that is not the place to configure your email. You need to be in Mail Preferences and to correct anything that is incorrect in there.
I use snow leopard and I have problems using mail. Everytime I start mail I get the message to configure my mail. I cannot enter my existing mails anymore. When I look to the library/mail my account is still there. I also replaced this with a backup from earlier but still the same.
How can I restore my existing mails again?