California Proof Of Service By Mail is a method of legally delivering documents to a specific person or entity by certified mail. It is a legally accepted and binding way to prove that an individual was served with a copy of a document or other legal notice. It is used in many legal proceedings, such as divorce, child support, and small claims court. There are three types of California Proof of Service By Mail: Regular Mail, Certified Mail, and Registered Mail. Regular mail is the most basic form of proof of service. It involves sending a copy of the document through the US Postal Service in an envelope with the recipient’s address and a return address. Certified mail involves sending a copy of the document through the US Postal Service in an envelope with the recipient’s address and a return address, and then having the post office provide a card that indicates when the recipient received the document. Registered mail involves sending a copy of the document through the US Postal Service in an envelope with the recipient’s address and a return address, then having the post office provide a card that indicates when the recipient received the document, and finally having the post office provide a receipt that indicates when the document was delivered. In all three cases, the sender must provide an “Affidavit of Service” to the court, which is a sworn statement that attests that the documents were sent and received. This document must be signed and notarized and must include the date, time, and method of service.