Maryland Code, Estates and Trusts § 7-104

(a) Not later than 20 days after the appointment of a personal representative, the personal representative shall deliver to the register the text of the first published newspaper notice of the appointment and shall advise the register of the names and addresses of the heirs of the decedent and of the legatees to the extent known by the personal representative, so that the register may issue the notices provided in § 2-210 of this article.

(b) The provisions of this section do not apply to a successor personal representative if notice under this section has been given previously, or to a person appointed pursuant to judicial probate.