About Attachment to Notice of Petition to Administer Estate—Proof of Service by Mail
Continuation page for listing additional people served by mail with the Notice of Petition to Administer Estate (DE-121).
When you'd use it: Attach to the DE-121 when there are more names than fit on its proof of service by mail.
Where to get the official form
The official version of Attachment to Notice of Petition to Administer Estate—Proof of Service by Mail is published as a PDF by the California courts. We checked this link and it resolved to a form on an official court or government website — always download the current version directly from the source rather than a third-party copy:
Verified official PDF
Download Attachment to Notice of Petition to Administer Estate—Proof of Service by Mail (PDF) →
Source: courts.ca.gov
Link last checked: November 3, 2026
How to file Attachment to Notice of Petition to Administer Estate—Proof of Service by Mail in California
- Step 1 — Confirm you have the correct formUse Attachment to Notice of Petition to Administer Estate—Proof of Service by Mail (DE-121(MA)) when attach to the DE-121 when there are more names than fit on its proof of service by mail. Double-check it's the right form for your situation — California probate forms are revised periodically, so verify the name and number against your court's current form list before you start.
- Step 2 — Complete every required fieldFill out Attachment to Notice of Petition to Administer Estate—Proof of Service by Mail carefully and review it for errors before filing. Probate cases can already take months — a small mistake on the form can set your timeline back further.
- Step 3 — Get it notarized or witnessed if requiredSome probate forms must be signed in front of a notary or witnesses. Check the instructions on the form itself, and arrange notarization before you file if it's required.
- Step 4 — File it with the correct courtSubmit Attachment to Notice of Petition to Administer Estate—Proof of Service by Mail to the probate court or county clerk handling the estate — usually in the California county where the deceased lived. Ask the clerk how they prefer to receive filings (in person, by mail, or e-filing).