246 Pa. Code § 313 : MINOR COURT CIVIL RULES — GENERAL — CIVIL ACTION — Service Outside the Commonwealth

When service of the complaint is to be made upon a defendant outside the Commonwealth, it shall be made:

(1) by delivery in the manner prescribed by Rule 308, 309, 310 or 311, whichever is applicable, by a Pennsylvania sheriff or constable or by any adult, other than the plaintiff designated by the magisterial district judge or
(2) by certified mail or comparable delivery method resulting in a return receipt in paper or electronic form as provided by Rule 308, 309 or 310, whichever is applicable;
(a) if the mail is returned with a notation by the postal authorities or commercial carrier that receipt was refused, then the magisterial district judge may serve the complaint by sending a copy of the complaint by ordinary mail to the same address with the return address on the envelope. Service by ordinary mail is complete if the mail is not returned to the sender within fifteen days after the mailing; or
(b) if the mail is returned with a notation by the postal authorities or commercial carrier that it was unclaimed, the plaintiff shall make service by another means pursuant to these rules, or
(3) in the manner provided or prescribed by the law of the place in which service is to be made for service in that place in an action in any of its courts of general jurisdiction.

246 Pa. Code § 313