Notarized Document Mailing: What to Know Before You Send
By Justin Winter · Updated August 22, 2026
Certified Mail proves a document was mailed and delivered — it says nothing about whether a signature inside it is genuine. Notarization proves a signature is genuine — it says nothing about how the document travels afterward. If you need both, get the document notarized first, then send the notarized original by Certified Mail.
"I need to send this notarized" and "I need to send this Certified" sound like the same request. They are not. One is about whether a signature is genuine. The other is about whether you can prove a piece of mail was sent and received. Mixing them up is common — and it can leave you with proof of the wrong thing right when a deadline is on the line.
Two different jobs
- Notarization verifies a signature. A notary public confirms your identity, watches you sign (or acknowledge a signature), and attaches a notarial certificate. It happens before the document ever reaches an envelope, and it has nothing to do with how the document is delivered afterward.
- Certified Mail verifies a delivery. USPS scans the piece from acceptance to delivery, hands you a mailing receipt, and — with the electronic Return Receipt added — a signed, dated delivery record. It has no opinion on whether anything inside the envelope is genuine, accurate, or properly executed.
A notarized document that gets lost in the mail is still notarized. A perfectly ordinary, unnotarized letter sent Certified is still unnotarized. The two facts are independent, and a recipient — a court clerk, a title company, a government agency — usually needs both if the document itself requires notarization at all.
The order that actually works
- Get the document notarized first. Options include a bank branch, a UPS Store, a mobile or walk-in notary public, or remote online notarization (RON) by video call, if your state and the recipient accept it.
- Mail the notarized original — or, if the recipient accepts it, a clean scan printed from a notarized PDF — using Certified Mail if you need proof it was sent and received, or Certified plus the electronic Return Receipt if you need a signed delivery record too.
Doing it in the other order does not work: mailing something Certified before it is notarized does not retroactively notarize it once it lands on the recipient's desk, and there is no mail class that adds notarization along the way.
Where paperplane fits
paperplane prints and mails documents — it is not a notary service and does not verify signatures. What it does well is the second half of the job above: once your document is notarized (an original you have in hand, or a scanned PDF of one), upload it and paperplane prints it, stuffs it in an envelope, and sends it via USPS. Choose First-Class ($1.99 all-in) for routine copies, Certified ($12.99 all-in) when you need proof it was mailed and delivered, Certified with the electronic Return Receipt ($14.99 all-in) when you also need a signed delivery record, or Priority ($24.99 all-in) when speed matters more than proof.
| Need | Where it happens |
|---|---|
| Verify a signature is genuine | A notary public (in person or via RON) — not paperplane, not USPS |
| Prove a document was mailed | Certified Mail |
| Prove a document was delivered, with a signature | Certified Mail + electronic Return Receipt |
| Print and mail an already-notarized document | paperplane |
Related reading: what is Certified Mail, USPS Certificate of Mailing explained, or legal mailing services for attorneys and pro se filers.
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Common questions
Does Certified Mail notarize my document?
No. Certified Mail is a USPS tracking and proof-of-mailing service — it confirms when a piece was accepted and delivered, and gives you a receipt for that. It has no involvement with the signatures inside the envelope. USPS clerks are not notaries, and dropping a document in the Certified Mail stream does not make any signature on it legally verified.
If I mail a document Certified, does that "certify" its contents?
No — this is the most common mix-up. "Certified" in Certified Mail refers to the mailing being certified by USPS (tracked, receipted), not to the contents of the letter being certified as true, accurate, or properly executed. A contract, affidavit, or notice does not become more legally valid because it traveled Certified.
Can paperplane notarize my document for me?
No. paperplane is a printing-and-mailing service, not a notary. If you have a document that needs a genuine, verified signature, get it notarized first — at a bank, a UPS Store, a mobile or walk-in notary public, or through remote online notarization (RON) if your state and the receiving party allow it. Once you have the notarized original (or a clear scan of it), paperplane can print and mail it for you.
What is remote online notarization (RON)?
RON lets a notary verify your identity and witness your signature over a live video call instead of in person. A growing number of states allow it, and some require the receiving party (a court, a lender, a title company) to accept it — check first if the destination has specific requirements. RON typically produces a notarized PDF with an electronic notarial certificate, which you can then print and mail.
I have a notarized affidavit with a court deadline — what should I send it with?
Certified Mail, and ideally with the electronic Return Receipt added ($14.99 all-in through paperplane) so you have a dated, signed delivery record along with the mailing receipt. That combination — a genuine notarized signature plus USPS proof of when it arrived — is exactly the pairing courts and agencies expect for deadline-sensitive filings.