Maryland Code, Business Regulation § 5-307

(b)(1) At least 90 days before a registration or permit expires, the Director shall mail or electronically transmit to the registrant or permit holder:

(2) If an electronic transmission under paragraph (1) of this subsection is returned to the Director as undeliverable, the Director shall mail to the registrant or permit holder, at the last known address of the registrant or permit holder, the materials required under paragraph (1) of this subsection within 10 business days of the date the Director received the notice that the electronic transmission was undeliverable.

(1) is otherwise entitled to be registered or to receive a permit;

(2) meets the qualifications set forth for an original registration or permit;

(3) pays the renewal fee set by the Director; and

(4) submits to the Director a renewal application on the form that the Director provides.