Edit->Accounts should be more intuitive
Most users will probably only use one account, so it would be great to be directly able to edit settings when you do "Edit -> Accounts". A way to do that would be to split the window in two, display the list of accounts on the left, and the settings on the right. See Mozilla Thunderbird for an example of what I mean ( http://laughingsquid.net/faq/examples/pop.php )