4 Pa. Code § 615.19
(c) Content of brief. A post-hearing brief does not need to conform to a specific format but must include the following:
(d) Service. On the date of filing, a party shall simultaneously serve a copy of the brief on the opposing party by first class mail, unless the parties mutually agree to accept service by electronic mail. A party shall include with their brief a certificate of service indicating proper service on the opposing party. The following apply: