Maryland Family Law Section 10-131

      (a)      If the address of a recipient changes, the recipient, within a reasonable time, shall send the change of address by certified mail, return receipt requested to:

            (1)      the court;

            (2)      the obligor, at the obligor's last known address; and

            (3)      (i)      each employer who has been served with a copy of the earnings withholding order; or

                  (ii)      if the support enforcement agency receives the support payments, the support enforcement agency.

      (b)      If, because of the failure of a recipient to give notice under this section, an employer or the support enforcement agency is unable for a 2-month period to deliver deductions under the earnings withholding order, the employer or agency:

            (1)      may not make further deductions;

            (2)      shall return each undeliverable payment to the obligor; and

            (3)      shall notify the court.