[mail-crypt-plugin] Password Query for Folder Keys questions

In Folder key plugin operation mode, using the following password query:

password_query = SELECT
email as user, password,
'%w' AS userdb_mail_crypt_private_password
FROM virtual_users WHERE email='%u';

Say I have two 'email' users...will each 'email' have a 'userdb_mail_crypt_private_password' field with a plaintext password (%w) in it?

And is the 'userdb_mail_crypt_private_password' used automatically to decrypt the user private key which is stored in 'mail_attribute_dict' ?

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