Md. Rule 1-321

Summary

(a) Generally. — Except as otherwise provided in these rules or by order of court, every pleading and other paper filed after the original pleading shall be served upon each of the parties. If service is required or permitted to be made upon a party represented by an attorney, service shall be made upon the attorney unless service upon the party is ordered by the court. Service upon the attorney or upon a party shall be made by delivery of a copy or by mailing it to the address most recently stated in a pleading or paper filed by the attorney or party, or if not stated, to the last known address. Delivery of a copy within this Rule means: handing it to the attorney or to the party; or leaving it at the office of the person to be served with an individual in charge; or, if there is no one in charge, leaving it in a conspicuous place in the office; or, if the office is closed or the person to be served has no office, leaving it at the dwelling house or usual place of abode of that person ...