Probate Court Procedure: Demand for Accounting

My question involves estate proceedings in the state of: New Jersey

Does anyone know, if it is required, that a Demand for Accounting be sent certified mail in New Jersey? I tried looking it up in the statutes but couldn't find anything. I know the executor will not go to the post office and pick it up. If it matters, It is a will, not a trust.

Thanks

Probate Court Procedure: Demand for Accounting