55 Pa. Code § 41.24
(a) Each certificate of service must substantially conform to the following:
I hereby certify that I have this day served the foregoing document upon: (Identify name and address of each person served) by (Indicate method of service).
This section cited in 55 Pa. Code § 41.23 (relating to proof of service); and 55 Pa. Code § 41.92 (relating to expedited disposition procedure for certain appeals).