To prepare a certified mail envelope, address it as you normally would, fill out PS Form 3800 and fold it over the top edge of the envelope to the right of your return address, attach PS Form 3811 to the back if you want a physical return receipt, and take the envelope to a post office counter so the clerk can postmark your receipt. A standard one-ounce certified letter with a physical return receipt runs about $10.48 in total postage and fees as of January 2026.1United States Postal Service. Notice 123 – Price List
What to Gather First
You need four things: your letter, a standard envelope, PS Form 3800 (the certified mail label with the barcoded tracking number), and PS Form 3811 (the green return receipt card) if you want physical proof of delivery. Both forms are free at any post office counter. PS Form 3800 can also be printed from the USPS website, but the counter version is easier to work with because it comes with pre-cut adhesive strips.2United States Postal Service. PS Form 3800 – Certified Mail Receipt
Decide up front how you want proof of delivery. The physical green card comes back to you in the mail with the recipient’s signature. The electronic version arrives as a PDF, costs less, and doesn’t require Form 3811. If you go electronic, tell the clerk when you drop off the envelope and skip the green card entirely.
If only a named individual should be allowed to sign, ask about restricted delivery when you get to the counter. That’s a different fee structure and useful when you’re serving legal documents on a specific person.3USPS. What is Restricted Delivery?
Filling Out PS Form 3800
PS Form 3800 is a self-adhesive label that does two jobs. Part of it sticks to the envelope. The detachable top becomes your mailing receipt.4PostalPro. Certified Mail Guidebook
Write the recipient’s full name and complete mailing address in the addressee section. Fill in your name and return address in the sender’s area. The tracking number and barcode are already printed, so there’s nothing to generate.
Look at the small barcoded strip along the bottom edge of the form. Don’t throw it away. You’ll peel it off and put it on the return receipt card in the next step, and it’s what links the two forms through a single tracking number.
Filling Out PS Form 3811 (If You’re Using It)
Skip this section if you chose the electronic return receipt. If you’re using the green card, it’s the piece of evidence that comes back to you carrying the recipient’s signature and the date of delivery.5United States Postal Service. Domestic Return Receipt Forms
On the front:
- Box 1: the recipient’s full name and complete address, exactly as it appears on the envelope.
- Box 2: peel that small barcoded strip off PS Form 3800 and stick it here.
- Box 3: check the box next to “Certified Mail.”
Flip the card over and print your own name and mailing address on the back. That’s where USPS will send the card after delivery. A physical card can take a week or more to arrive after the letter is delivered, which is worth knowing if you need confirmation fast.
Placing Everything on the Envelope
Address the envelope in the normal way. Recipient’s full name and address centered on the front, your return address in the upper-left corner, dark ink so scanners can read it.
Take PS Form 3800 and line up its dotted fold line with the top edge of the envelope, positioning the label to the right of your return address. Fold the top portion over the edge so the barcode faces outward and stays visible after folding. Leave the upper-right corner clear for postage.4PostalPro. Certified Mail Guidebook
If you’re using the physical return receipt, peel the backing off PS Form 3811 and attach it to the back of the envelope. Keep it clear of the delivery address, the return address, and the certified mail label. Don’t let it wrap around to the front.
Take It to the Counter, Not the Mailbox
This is where preparation either holds up or falls apart. You can legally drop certified mail into a blue collection box or hand it to your carrier, but if you do, your receipt won’t carry a USPS postmark. Form 3800 itself says the receipt “should bear a USPS postmark” to serve as legal proof of mailing.2United States Postal Service. PS Form 3800 – Certified Mail Receipt
For anything with a legal purpose behind it (a filing deadline, notice to a landlord, a response to a government agency), go inside. The clerk weighs the envelope, applies postage, stamps the receipt with the date, detaches the top portion of PS Form 3800, and hands it back to you. That stamped slip is your proof of mailing. Store it somewhere you’ll find it later, and definitely not inside the envelope you just mailed.
After You Mail It
The 20-digit number on your receipt is a live tracking number. Enter it at the USPS Tracking page to see each scan from acceptance through delivery.6United States Postal Service. USPS Tracking
Before the envelope leaves your hands, photograph or photocopy the addressed envelope, the filled-out forms, and your stamped receipt. If the green card is lost on its way back, the tracking record and your photo of the receipt are what you fall back on. Check the recipient’s address once more against your source document too. A certified letter sent to the wrong address doesn’t prove notice to anyone.