Certified Mail is a USPS extra service that gives the sender a mailing receipt and electronic verification that a letter or package was delivered, or that delivery was attempted. It is added to First-Class Mail or Priority Mail, and it is the standard way to prove you sent a legal notice, tax response or contract on a specific date.
Certified Mail does not make mail faster or insure it. USPS handles a certified piece in transit like ordinary mail of the same class; what you pay for is the paper trail. This guide explains how the service works, what you can add to it, how it differs from Registered Mail and Signature Confirmation, and what happens when nobody is home to sign.
How does Certified Mail work?
You attach the green PS Form 3800 label to the envelope, above the delivery address and to the right of the return address, and present it at a Post Office counter or with a mailer-generated label that carries a USPS barcode. The clerk can round-date your sender’s receipt, which is your proof of the mailing date. From there, USPS records acceptance, transit and delivery scans against the item’s tracking number.
At delivery, the carrier obtains a signature, and USPS keeps a record of delivery that includes that signature. Online tracking shows the delivery or attempt, and you can request the delivery record afterward. Step-by-step instructions, including filling in the forms, are in our guide on how to send Certified Mail.
| What you get | How it works |
|---|---|
| Mailing receipt | Sender’s receipt from PS Form 3800, round-dated at acceptance on request |
| Delivery verification | Electronic confirmation of delivery or attempted delivery, viewable in USPS Tracking |
| Signature record | USPS keeps a delivery record that includes the recipient’s signature |
| Eligible mail classes | First-Class Mail and Priority Mail |
| Insurance | None from Certified Mail itself; Priority Mail’s included coverage (up to $100) still applies |
| Destinations | US addresses, including APO/FPO/DPO, US territories and the Freely Associated States |
Which mail can be sent Certified Mail?
Certified Mail is available only with First-Class Mail and Priority Mail, according to the USPS Domestic Mail Manual (DMM 503.3). That covers ordinary letters, large envelopes and Priority Mail packages. It is not offered on USPS Ground Advantage, Media Mail, USPS Marketing Mail or international mail.
If you are unsure whether a document should go First-Class or Priority, our comparison of Priority Mail vs First-Class Mail covers speed and size limits. First-Class Mail delivers in 1–5 days and Priority Mail in 2–3 days, per USPS, and adding Certified Mail does not change either.
What can you add to Certified Mail?
Three add-ons build on Certified Mail, and they are what most people mean when they ask for “certified with a green card.”
- Return Receipt: captures the recipient’s signature and sends it to you, either as the hardcopy green card (PS Form 3811) or electronically by email. Electronic return receipts are not available for APO/FPO/DPO, some US territories or the Freely Associated States. Our guide to USPS return receipt tracking explains how to retrieve each type.
- Certified Mail Restricted Delivery: limits delivery to a named individual or their authorized agent, and USPS may ask that person for photo ID. It can only be bought together with Certified Mail.
- Adult Signature: a separate service for Priority Mail that requires a signer aged 21 or older. It is added to an online label purchase, not at the Post Office counter.
Each add-on carries its own USPS fee on top of postage and the Certified Mail fee. Our Certified Mail cost guide walks through how those pieces add up, and the USPS shipping calculator guide explains how postage itself is figured.
Certified Mail vs Registered Mail vs Signature Confirmation
The three services are often confused, but they protect different things. Certified Mail proves sending and delivery; Registered Mail protects valuables in transit; Signature Confirmation proves a package was signed for.
| Feature | Certified Mail | Registered Mail | Signature Confirmation |
|---|---|---|---|
| Main purpose | Proof of mailing and delivery | Maximum security for valuables | Signed proof a package arrived |
| Handling in transit | Ordinary mail stream | Chain of custody receipts from acceptance to delivery | Ordinary mail stream |
| Insurance | None (beyond Priority Mail’s included coverage) | Insurable up to $50,000 | None (beyond the mail class’s included coverage) |
| Mail classes | First-Class Mail, Priority Mail | First-Class Mail, Priority Mail, Ground Advantage | Priority Mail, Ground Advantage, Media Mail and other package classes |
| Where to buy | Post Office, or with an eligible mailer label | Post Office counter only | Online or at the Post Office |
For packages that just need a signature, USPS Signature Confirmation is usually the better fit, because it works with Ground Advantage and doesn’t require the green label.
What happens if no one is home to sign for Certified Mail?
The carrier leaves a PS Form 3849 notice, and the item is held at the local Post Office. USPS lists a second notice five days after the first and a total hold of 15 days from the first delivery attempt, after which unclaimed Certified Mail is returned to the sender. The recipient can pick it up or request redelivery during that window.
A returned, unclaimed letter still gives you the round-dated mailing receipt and the attempted-delivery record. Whether that counts as legal notice depends on the statute or agency involved, so check the rule that requires the mailing. Agencies are large recipients too; see how often the IRS picks up Certified Mail if you’re sending a tax response.
When should you use Certified Mail?
Use it whenever a law, contract or agency requires proof that you mailed something, or when you might later need to show the recipient received it. Common cases include:
- Landlord and tenant notices, such as lease terminations and security-deposit letters
- Responses to the IRS or a state tax agency
- Debt validation letters and formal disputes
- Contract notices, cancellations and demand letters
- Court-related mailings where the rules allow Certified Mail service
For everyday packages where you only want tracking and a fair price, a standard USPS label is enough; you can compare USPS rates for Priority Mail and Ground Advantage in the free ParcelPath calculator. The broader USPS shipping guide covers every mail class, and our roundup of shipping services and solutions compares options across carriers.
Frequently Asked Questions
What is Certified Mail?
Certified Mail is a USPS extra service that provides a mailing receipt and electronic verification that an item was delivered or that delivery was attempted. It is available only with First-Class Mail and Priority Mail. It adds proof, not speed or insurance, since certified pieces travel in the ordinary mail stream for their class.
Does Certified Mail require a signature?
Yes. The carrier obtains a signature at delivery, and USPS keeps a record of delivery that includes it. To receive a copy of the signature yourself, add a Return Receipt, either the green card (PS Form 3811) or the electronic version by email. Restricted Delivery adds a further rule that only the named person can sign.
How long does USPS hold Certified Mail?
USPS holds Certified Mail for 15 days from the first delivery attempt. The carrier leaves a PS Form 3849 notice at the first attempt, and a second notice follows after five days. If no one picks up the item or schedules redelivery within the 15 days, it is returned to the sender as unclaimed.
Is Certified Mail the same as Registered Mail?
No. Certified Mail proves mailing and delivery but travels as ordinary mail and includes no insurance of its own. Registered Mail is the most secure USPS service: it is tracked through a chain of custody receipts, must be presented at a Post Office counter, and can be insured up to $50,000.
Sources
- USPS Domestic Mail Manual 503: Extra Services (Certified Mail, Registered Mail, Return Receipt)
- USPS: Insurance & Extra Services
- USPS FAQ: Second and Final Notice and Return Dates for Redelivery
- USPS: Mail & Shipping Services (delivery times)
Part of our USPS Services guide. Related: Ground Advantage, USPS Priority Mail, Priority Mail Express.
