Maryland Code, Estates and Trusts § 7-103.1

(1) Make a reasonably diligent effort to ascertain the names and addresses of the decedent's creditors; and

(2) Mail or otherwise deliver a notice to those creditors whose names and addresses the personal representative has ascertained of the time within which their claims may be presented under § 8-103(a) of this article.

(c)(1) The failure of a creditor to receive notice under this section shall not extend the time within which the creditor may present a claim beyond 6 months from the date of the decedent's death.

(2) The personal representative, individually and on behalf of the estate, is not liable for failing under this section to ascertain or notify a creditor or for giving notice to a person who is not a creditor of the decedent.