Maryland Code, Real Property § 14-605

(1) The holder is not a party in the proceeding and any judgment in the proceeding will not affect any claim of the holder; and

(2) If the holder elects to appear in the proceeding, the holder will appear as a defendant and be bound by any judgment entered in the proceeding.

(1) At the address set forth in the security instrument for the holder's receipt of notices; or

(2) If no address for the holder's receipt of notices is set forth in the security instrument, at the last known address of the holder.