MYSQL_SERVER		localhost
MYSQL_USERNAME		user
MYSQL_PASSWORD		password
MYSQL_DATABASE		mail
MYSQL_USER_TABLE	mail_users
MYSQL_CRYPT_PWFIELD	password_enc
MYSQL_UID_FIELD		uid
MYSQL_GID_FIELD		gid
MYSQL_LOGIN_FIELD	username
MYSQL_HOME_FIELD	homedir
MYSQL_MAILDIR_FIELD maildir