How to Send a Demand Letter: Certified Mail, Email and Proof of Delivery

What is the best way to send a demand letter?

The best way is any method that lets you prove what you sent, when you sent it and that it reached the right person. For most California demands, that means Certified Mail with a Return Receipt, plus a same-day email copy if you have a working address. When a statute or your contract names a method, follow it exactly.

No single method is required for every demand letter. The California Courts Self-Help Guide says that before small claims you can ask for the money in person, by letter or by email. The method matters most when a law ties a deadline or a remedy to it.

How much does certified mail cost as of October 2026?

USPS prices changed on October 4, 2026. These are the retail figures in the Postal Service's Notice 123 price list and its extra services page.

Example: a one-ounce letter by Certified Mail with an electronic Return Receipt costs $0.82 + $5.55 + $2.91 = $9.28. With the green hard-copy card instead, the total is $11.02. Heavier envelopes with exhibits cost more in postage, so weigh them at the counter.

When does California law dictate how a demand is delivered?

A few statutes attach rules to the delivery itself. Miss them and you can lose a remedy even if the letter is otherwise perfect.

• Consumers Legal Remedies Act. Civil Code section 1782 calls for a written notice, sent by certified or registered mail with a return receipt requested, at least 30 days before a damages suit. It goes to where the transaction happened or to the company's main California office.
• Bounced or stopped checks. Civil Code section 1719 requires the written demand to be mailed by certified mail. The writer has 30 days from the mailing date to pay. In a stop-payment case, a court cannot award damages unless it receives a copy of the demand and a signed certified mail receipt showing delivery, or attempted delivery if refused.
• Your contract. Many contracts have a "Notices" clause naming an address, a method (mail, courier or email) and when notice counts as received. Follow it word for word, and send a courtesy copy by email if the clause allows it.

Which person or entity you address matters as much as the method. A letter to the wrong business name can create arguments later; see our guide to finding a business's legal name in California.

How to send a demand letter by certified mail, step by step

1. Print two copies: one to mail and one for your file. Sign and date both.
2. Make a copy of every enclosure, and list the enclosures at the bottom of the letter.
3. Address the envelope to the correct legal name and the address required by any statute or contract notice clause.
4. At the Post Office, ask for Certified Mail and choose a hard-copy or electronic Return Receipt.
5. Have the clerk postmark your Certified Mail receipt. Staple it to your file copy.
6. Email a PDF of the signed letter the same day, if you have a working address, and note in the email that the original is coming by certified mail.
7. Track the article number online and save a screenshot or printout when it shows delivered.
8. File the return receipt with your copy when it arrives, and calendar your response deadline.

Can you send a demand letter by email, text or hand delivery?

Yes, where no statute or contract requires a mailed notice. Email is fast and leaves a timestamp, but it is easy for the recipient to say it went to spam. Text messages are easy to miss and hard to print cleanly. Hand delivery works if you bring a witness or get a signed acknowledgment.

Pairing two methods covers the weak spot of each. Certified mail plus email is a common combination.

Checklist: the proof of delivery to keep

• An exact copy of the letter as sent, with every enclosure.
• The postmarked Certified Mail receipt with the article number.
• The tracking history, printed or saved as a PDF.
• The Return Receipt card or the electronic signature record.
• The sent email, with the attachment and the timestamp.
• Any returned envelope, kept unopened.
• A short log of follow-up calls and replies, with dates.

Bring this file to small claims or to your lawyer. Form SC-100 asks whether you asked the defendant to pay before suing, and your file answers that question with documents.

What if the letter is refused or comes back unclaimed?

Keep the returned envelope sealed and resend by First-Class Mail with a Certificate of Mailing, plus email. A refusal does not erase your demand. For a stopped check, Civil Code section 1719 expressly accepts a signed certified mail receipt showing attempted delivery that was refused as part of the required proof.

Do not let a delivery problem eat your filing window. The statute of limitations keeps running while letters go back and forth; our guide to California statutes of limitations lists the common deadlines.

Getting the address, the method and the letter right the first time

Delivery mistakes are quiet ones: a CLRA notice sent to the wrong address, a contract notice clause nobody read, or a bad check demand mailed without the terms section 1719 requires. An attorney can account for each of these before the envelope is sealed.

Through Talk to My Lawyer, a licensed California attorney writes your letter from your facts and documents, addresses it to the right party, and sends it on your behalf by the method your claim calls for. Deadlines depend on your facts, so check yours with a lawyer.