FL-335 is a California family court form used to prove that documents in a family law case were served by mail to the other party or another required recipient. Proper service of documents is essential because it ensures all parties have notice of what has been filed in the case. FL-335 acts as the official record confirming that the documents were mailed correctly and in compliance with California law. Without a valid proof of service, the court cannot act on the documents that were filed.

The form identifies which documents were mailed—such as a Response, Request for Order, financial disclosures, or hearing-related attachments—and specifies the date and place of mailing. It also lists the full address of the person served. This information is important because service by mail is only valid if the documents are sent to the correct, last known address. FL-335 helps the court verify that the mailing was completed properly and that the other party received legal notice.

Service by mail must be completed by someone who is at least 18 years old and not a party to the case. This person, known as the server, signs FL-335 under penalty of perjury, attesting that they mailed the documents as stated. The server must deposit the mail in a U.S. Postal Service mailbox or hand it to the post office—they cannot simply leave it at home or give it to the party who needs to be served. Incorrect service can delay the case or invalidate filings.

After the server completes the form, FL-335 must be filed with the court. This filing provides the judge with legal verification that notice was given and that the other party had an opportunity to respond. Many court actions—such as hearings, temporary orders, or financial decisions—cannot move forward unless proof of service is on file. FL-335 ensures the court can proceed without violating due process rights.

In summary, FL-335 is a critical document that confirms family law papers were properly served by mail. It protects both parties by ensuring appropriate notice was given, and it helps the court verify that all procedural requirements were met. Filing a complete and accurate FL-335 keeps the case moving forward and prevents delays caused by improper service.