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FL-335Optional

Proof of Service by Mail

California · Judicial Council of California · Effective January 1, 2012

This form is used to tell the court that you mailed legal papers to the other person involved in the case. It asks you to list what papers were sent, when they were mailed, and where they were mailed from.

The court describes it as: Tells the court that you had the other party served legal papers by mail. Lists the papers that were served and tells when and where the papers were served, as well as who served them.

Open the official PDFfrom Judicial Council of California

Where this fits in a case

Hearing

Stage: Hearing

This form is used when a person needs to prove to the court that they sent legal documents to another party by mail.

Either party may file.

Official instructions

How-to guides published by the court for this form.

Common questions

Who fills out this form?
The form requires the signature of a person who is at least 18 years old, is not a party to the case, and lives or works in the county where the mailing happened.
What does this form prove?
It proves that specific legal documents were sent to the other party by being enclosed in a sealed, prepaid envelope and mailed.
Does this form cover all types of service?
The form notes that to serve temporary restraining orders, personal service must be used instead.

Revision history

No changes recorded since we started tracking this form on October 9, 2026. The current version took effect January 1, 2012.

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