"I hereby certify that on ___________________________________ I sent a copy of the foregoing matter to
(date)
the following parties of record or their representatives at the addresses indicated, by depositing same in a United States mail receptacle with sufficient postage affixed.
(Signed) _______________________________________________"
(party or representative)
Unless excepted by 621-subrule 16.4(2), proof of service shall be filed electronically in accordance with 621-Chapter 16.
Iowa Admin. Code r. 621-2.15