TOOL
Do I need Certified Mail?
By Justin Winter · Updated October 2, 2026
The short answer
You need Certified Mail when a contract, lease, statute or court rule asks for it, or when you may later have to prove you sent a letter and when. Add the electronic Return Receipt when you may need to prove delivery and who signed. If nothing requires a method and nothing needs proving, First-Class is enough. Answer four questions below for a recommendation for your letter.
Most letters do not need Certified Mail. The ones that do tend to be the ones where a deadline, a deposit or a dispute depends on showing that the letter went out, and when. Four questions sort out which kind yours is.
General information about USPS services, not legal advice. Some notices only count if they are delivered exactly the way a contract, lease, statute or court rule says, so read that text first, and ask a lawyer if a deadline or a right depends on it.
Requirements come first
Many notices have a delivery method set for them before you write a word: a lease's notice clause, a contract's notices section, a state statute on security deposits or evictions, a court rule. When one of those names a method, following it is what makes the notice count, so the tool asks about it before anything else. If you are not sure whether one applies, it recommends at least Certified Mail and tells you to check.
What each answer gets you
- First-Class ($0.99): the letter goes to the mailbox. No mailing record and no tracking.
- Certified Mail ($12.99): a record of the date it was mailed and USPS tracking through delivery.
- Certified Mail with electronic Return Receipt ($14.99): all of that plus a signed USPS delivery record, emailed to you.
Each price is all-in for one printed page, postage included, and comes from the same pricing the send flow charges. For more pages or color, use the Certified Mail cost calculator.
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Questions before you send
Is this legal advice?
No. It is general information about what each USPS service records, applied to your answers. Whether a notice is valid depends on the contract, lease, statute or court rule behind it. If a deadline or a right depends on the letter, read that text and ask a lawyer.
What if my contract or a statute names a delivery method?
Use that method, exactly as written. A notice clause that says "certified mail, return receipt requested" is asking for both. One that says personal delivery or Registered Mail is not satisfied by Certified Mail, however careful it is. When the text allows several methods, any one of them usually works.
What is the difference between proof of mailing and proof of delivery?
Certified Mail gives you a record of the date the letter entered the mail and USPS tracking through delivery, which is what you need when a deadline counts from the day you send. The electronic Return Receipt adds a signed USPS delivery record showing who signed and when, which is what you need when a deadline counts from receipt or the recipient may deny getting it. One page is $12.99 Certified, or $14.99 with the Return Receipt, all-in.
What happens if the recipient refuses Certified Mail?
USPS returns it to you marked refused or unclaimed, and the tracking shows the delivery attempts. Some contracts and statutes treat a refused notice as delivered and some do not. That is why the tool suggests sending an identical First-Class copy the same day when refusal is possible: First-Class needs no signature, so it goes into the mailbox.
Is the electronic Return Receipt the same as the green card?
They record the same thing, a signature on delivery, in different forms. The green card (PS Form 3811) is mailed back to you; the electronic Return Receipt is emailed as a PDF. paperplane sends the electronic one. If your contract or statute specifically names the green card, check whether the electronic version satisfies it before you rely on it.
When is First-Class enough?
When nothing requires a particular method and you would never need to show the letter was sent: an invoice, an update, a personal letter. One page is $0.99 all-in. Tracking cannot be added after a letter is mailed, so if there is a chance you will need proof, send it Certified from the start.