First, there is no mms-sms.db
in the Android SDK.
Second, there is no content provider for SMS in the Android SDK.
Third, there are many, many email clients for Android, including two that ship with the Android open source project, others created by device manufacturers, and third-party ones downloaded by users.
Fourth, none of those are part of the Android SDK, and I am not aware of any that have a documented content provider API (though some of the third-party ones might).
Hence, you cannot do what you want from the Android SDK. If you wish to integrate with third-party email clients (e.g., K-9), you can ask them how best to do that. There are no supported integration points with Email, Gmail, or the device manufacturer email clients.