USPS Certified Mail gives the sender a mailing receipt and electronic verification that a letter or document was delivered or that a delivery attempt was made. It is available only on First-Class Mail and Priority Mail. USPS Registered Mail is a security service for valuables, insurable up to $50,000. For an ordinary order in a USPS Ground Advantage package, neither is the right tool: Signature Confirmation is.

Those eligibility rules and limits are on the USPS Insurance and Extra Services page. The definitions live in the Certified Mail and Registered Mail glossary entries. This post is the decision, from a seller’s side of the counter.

The four USPS options side by side

Regular First-Class Mail Certified Mail Signature Confirmation Registered Mail
What it is for Envelopes and postcards Proof a document was mailed, and a record of delivery or attempted delivery Proof a package was signed for Maximum security for valuables
Works with Letters and large envelopes First-Class Mail, Priority Mail Priority Mail, USPS Ground Advantage, and some others Priority Mail, First-Class Mail, USPS Ground Advantage
USPS fee, on top of postage None $5.55 $4.15 online, $5.15 at a Post Office From $20.90
Signature at delivery No Yes; you get the signature record only if you add Return Receipt Yes Yes; you get the signature record only if you add Return Receipt
Insurance None None of its own Whatever the mail class includes Up to $50,000
Where to mail it Anywhere Bought at a Post Office or on a shipping label that supports it; hand it to a postal employee only if you want a postmarked receipt With the label Handed to a postal employee

Fees are the prices shown on the USPS extra services page on October 12, 2026. The Certified Mail, Return Receipt, and Registered Mail fees match the USPS price list, Notice 123, effective October 4, 2026. All of them are charged in addition to postage.

Certified Mail: for a document, not for an order

Certified Mail answers one question: can you prove you sent this, and show what happened at the other end? USPS describes it as a way to “prove you sent it” and to “see when it was delivered or that a delivery attempt was made.” The sender gets a mailing receipt, and USPS provides electronic verification of delivery or attempted delivery. That record can show an attempt and not a delivery, so Certified Mail alone is not proof that a document arrived.

Certified Mail does not have to start at the counter. USPS’s consumer page says to buy it at a Post Office, and the Domestic Mail Manual, section 503 (3.2.1) also provides for a Certified Mail label used with a mailer-generated shipping label. Presenting the piece to a postal employee is required only when you want the receipt postmarked.

Two limits matter to sellers:

  • Certified Mail does not go on a Ground Advantage package. USPS lists it as available with Priority Mail and First-Class Mail only.
  • Certified Mail carries no insurance of its own. The USPS Domestic Mail Manual, section 503 states that no insurance coverage is provided when purchasing Certified Mail. A Certified piece sent by Priority Mail keeps the insurance Priority Mail already includes.

The recipient signs for Certified Mail at delivery, and USPS keeps that record (DMM 508, section 1.1.7, and DMM 503). What is not automatic is your copy of it. USPS says Certified Mail provides a delivery record showing the recipient’s signature “when combined with Return Receipt,” which costs $4.65 for a mailed receipt or $2.91 for an emailed one.

So the seller uses for Certified Mail are paperwork: a notice to a supplier or landlord, a tax filing, a letter where the mailing date itself may be questioned later. If all you need is evidence of the mailing date, a Certificate of Mailing is $2.45 and is issued only at the Post Office at the time of mailing.

Signature Confirmation: proof a package reached a person

For an order, the service that matches what a seller usually wants from Certified Mail is Signature Confirmation. USPS says it adds security “by requiring a signature,” provides the date and time of delivery or attempted delivery, and that USPS keeps a delivery record you can request by email. It works with Priority Mail and USPS Ground Advantage, and it is cheaper when added to an online label ($4.15) than at the counter ($5.15).

Insurance changes the picture slightly. Under the Domestic Mail Manual, an item insured for more than $500 gets a signature captured at delivery, so a high-value insured package already has a signature record.

Marketplaces set their own rules for what counts as proof of delivery on an expensive order, and those rules are theirs, not USPS’s. The signature confirmation glossary entry covers the options, and the eBay guide on proving delivery over $750 is one example of a marketplace rule.

Registered Mail: when the item cannot be replaced

USPS describes Registered Mail in one line: “Get maximum security for your valuable items.” It can be insured for up to $50,000, which is ten times the $5,000 ceiling on ordinary USPS insurance, and the fee starts at $20.90 before postage.

The rules are stricter than for anything else a seller mails, and they are where first attempts fail:

  • It must be handed to a postal employee. USPS says to present Registered Mail to a postal employee regardless of how the service was purchased. It cannot be dropped in a collection box. The Domestic Mail Manual names a retail employee at a Post Office, or a rural carrier, as the place to hand it over.
  • Common mailers are not accepted. The Domestic Mail Manual does not allow registration for a padded envelope, a spun-bonded olefin mailer such as Tyvek, a plastic envelope or mailer, or an envelope of glossy-coated paper. The poly mailer most sellers reach for is out.
  • The seal has to show tampering. Tape must visibly damage the envelope or wrapper if it is removed.
  • You must declare the full value. The manual says the mailer must always declare the item’s full value, whether or not you carry private insurance.

USPS publishes no delivery-time claim for Registered Mail on its extra services page. Choose it for security, and do not choose it for a deadline.

Regular mail: fine for paper, wrong for products

First-Class Mail is, in the words of the USPS First-Class Mail page, for envelopes and postcards. Tracking is not part of the base service. Letters go up to 3.5 oz and large envelopes up to 13 oz.

Sellers sometimes try to send a small product in a stamped envelope. USPS closes that door: a large envelope that is rigid, not rectangular, or not uniformly thick is charged package prices and handled as USPS Ground Advantage. For anything a buyer paid for, a tracked package service is the floor. Shipping small orders covers the cheapest tracked options for light items.

Which one to use

You are sending Use
A normal order, any value up to $100 USPS Ground Advantage or Priority Mail with included tracking and insurance
An order where you want a signature Add Signature Confirmation to the label
An order worth more than $100 Add insurance for the full value; over $500 a signature is captured
An item worth more than $5,000, or one that cannot be replaced Registered Mail, in an accepted wrapper, at the counter
A document whose mailing you may have to prove, with a record of delivery or attempted delivery Certified Mail, with Return Receipt if you need the signature
A document where only the mailing date matters Certificate of Mailing
A card or ordinary letter First-Class Mail

Sources

Checked October 12, 2026 against USPS Insurance and Extra Services, the USPS Domestic Mail Manual, section 503, USPS Notice 123 (effective October 4, 2026), and USPS First-Class Mail. Certified Mail and Registered Mail are USPS services.