/** The key of the configuration. e.g. Administrator */
    String MAIL_FROM_NAME = "mail.from.name";

    /** The key of the configuration. e.g. root@localhost */
    String MAIL_FROM_ADDRESS = "mail.from.address";

    /** The key of the configuration. e.g.  */
    String MAIL_HOSTNAME = "mail.hostname";

    /** The key of the configuration. e.g.  */