California Proof Of Service By Personal Delivery Or Mail is a method by which a party to a legal matter can prove that a document has been served on the other party. There are two types of California Proof Of Service By Personal Delivery Or Mail: Personal Delivery and Mail. Personal Delivery is when the document is delivered directly to the other party, either in person or by a third party such as a process server. The process server must provide proof of delivery, such as a signed waiver or an affidavit. Mail is when the document is mailed to the other party via certified mail, with return receipt requested. The return receipt must be signed by the recipient or their representative to prove that it was received. Both types of California Proof Of Service By Personal Delivery Or Mail require an appropriate form to be filled out and submitted to the court.