Md. Code, Tax-Prop. § 8-409

(a) The notice required by § 8–408 of this subtitle shall be served on the owner or other appropriate person by: (1) sending a copy of the notice by: (i) United States mail to the mailing address of the owner; or (ii) e–mail, if within the past 3 years the recipient has provided to the Department an e–mail address and requested to receive the notices by e–mail; or (2) if the owner is a nonresident of the State, or unknown or cannot be found, delivering a copy of the notice to a person in possession of the personal property. (b) When a notice is sent under this section, the Department or supervisor shall retain a record of the date of sending and the name and address of the person to whom the notice is sent. (c) If the service under subsection (a) of this section is given to the person charged with paying the property tax, this section is deemed complied with even if that person is accountable to shareholders or other persons.