Is It Illegal for the Post Office to Not Deliver Mail?

It is not automatically illegal for the post office to not deliver mail. Federal law does require the U.S. Postal Service to deliver at least six days a week under 39 U.S.C. § 101, but the statute and postal regulations carve out several legitimate reasons a carrier can skip your address, and a separate federal law makes it nearly impossible to sue USPS when mail is lost, delayed, or misdelivered.¹ Whether a missed delivery is a violation or a routine gap depends on why it happened.

What the Six-Day Delivery Law Actually Requires

The Postal Reorganization Act of 1970 created USPS as an independent agency and described postal service as a “basic and fundamental service” that must reach all communities, including rural areas and small towns where post offices operate at a loss.¹

The explicit six-day mandate came from the Postal Service Reform Act of 2022, which President Biden signed in April 2022 after years of proposals to drop Saturday delivery.² The law itself contains three exceptions built into the requirement: weeks containing a federal holiday, emergency situations like natural disasters, and geographic areas where USPS already delivered fewer than six days a week before the law took effect.¹ So a Saturday with no mail after a Friday holiday is not a violation. Neither is suspended service during a hurricane.

Legal Reasons a Carrier Can Skip Your Address

Beyond the exceptions in the statute, USPS regulations give carriers authority to bypass individual houses and even whole routes without breaking any law.

Hazardous Conditions

USPS suspends delivery when conditions endanger carriers, and the agency publishes service alerts covering natural disasters, quarantines, and other embargoes at postal facilities.³ Floods, wildfires, ice storms, and extreme weather all qualify. Suspensions end when conditions improve but can run for days or weeks.

Dogs

Loose or aggressive dogs are one of the most common reasons carriers stop delivery, and the problem is bigger than most customers realize. More than 6,000 letter carriers were attacked by dogs in 2024.⁴ When a carrier reports an unrestrained animal, a supervisor contacts the owner and asks that the dog be confined during delivery hours. If the owner does not comply, delivery stops, and it can stop for the entire route, not just the offending address. Neighbors then have to pick up mail at the local post office until the dog is secured.⁵

Blocked or Non-Compliant Mailboxes

Your mailbox and the path to it are your responsibility. The Domestic Mail Manual requires customers to keep the approach clear enough for safe access, and a postmaster can withdraw delivery until obstructions are removed.⁶ In winter, that means shoveling enough snow around a curbside box for the mail truck to pull up, deliver, and pull away without backing up.⁷

A mailbox that fails USPS installation standards can also be skipped. Curbside boxes must sit 41 to 45 inches above the road surface with the door set back 6 to 8 inches from the face of the curb.⁸ Boxes that are too low, too far from the road, or damaged can lose service until they are fixed. Before assuming USPS is at fault, confirm your box is compliant and accessible.

Why You Usually Cannot Sue for Lost or Delayed Mail

Even when USPS is clearly at fault, most people cannot recover damages in court. Sovereign immunity blocks lawsuits against the federal government unless Congress has specifically authorized them, and the Federal Tort Claims Act contains an exception aimed directly at postal matters. Under 28 U.S.C. § 2680(b), no claim can be brought “arising out of the loss, miscarriage, or negligent transmission of letters or postal matter.”⁹ That covers mail that never arrives, arrives late, arrives damaged, or ends up at the wrong address.

The Supreme Court reinforced that exception in United States Postal Service v. Konan, decided in February 2026. The Court explained that Congress judged tort lawsuits the wrong tool for mail delivery failures. Given how frequently postal workers interact with the public, allowing those suits would create an enormous burden on the government and the courts, and damages would turn on the value of mail contents USPS has no way to control.¹⁰

The practical result: if late delivery makes you miss a deadline, lose a payment, or forfeit an opportunity, the postal exception almost certainly bars a lawsuit. Administrative complaints are the realistic path.

When Nondelivery Becomes a Crime

Failing to deliver mail is not usually a crime, but deliberately interfering with mail is, and the rules apply to private citizens and postal employees.

Anyone who knowingly obstructs or slows mail delivery faces up to six months in prison, a fine, or both under 18 U.S.C. § 1701.¹¹ Blocking a mail truck or interfering with a carrier’s route would qualify.

Postal employees who hide, destroy, delay, or open mail entrusted to them face up to five years in prison. Lesser offenses involving newspapers or unauthorized opening of packages carry up to one year.¹² The USPS Office of Inspector General investigates internal theft and employees working with outside criminal groups to steal checks, cards, and other valuables from the mail stream.¹³

How to Report a Mail Delivery Problem

Complaints move through several tiers, and starting at the right level saves time.

Your Local Post Office

Start with the station manager at the post office serving your address. Most everyday problems get solved here: a new carrier who keeps missing your box, packages left in the rain, mail going to the wrong house. Look up your local office through the USPS website and speak with management directly.¹⁴

USPS Consumer Advocate

If the local office does not resolve it, escalate to the USPS Consumer and Industry Contact office. File online through the “Email us” page, call 1-800-ASK-USPS (1-800-275-8777), or write to the Office of the Consumer Advocate at 475 L’Enfant Plaza SW, Washington, D.C. 20260.¹⁴ Include dates, tracking numbers, and a clear description of what happened.

Office of Inspector General

Suspected employee theft, deliberate destruction, or intentional withholding of mail goes to the USPS Office of Inspector General rather than the regular complaint line. The OIG investigates mail theft, narcotics trafficking, contract fraud, and embezzlement by postal workers.¹³ Reports go through the OIG complaint portal.¹⁵

Postal Regulatory Commission

The Postal Regulatory Commission is an independent federal agency overseeing USPS compliance with service standards. Individual missed packages are not its focus; the PRC handles systemic patterns and can launch a formal proceeding when informal service inquiries reveal recurring problems.¹⁶ Contact the PRC when the problem reaches beyond your mailbox, such as an entire ZIP code seeing degraded service.

When a Lawyer Is Worth Calling

Lawsuits over lost or delayed mail rarely succeed because of the postal exception, but a few situations sit outside it. If a carrier injured you personally, damaged your property through negligence unrelated to mail handling, or engaged in intentional misconduct, the Federal Tort Claims Act may still provide a pathway.

Before filing any FTCA lawsuit, you have to submit an administrative claim on Standard Form 95, sent to USPS. The claim must state a specific dollar amount for the damages you are requesting; leaving that blank makes the claim invalid. The deadline is two years from the date the harm occurred, running from the event itself and not from when you send the form.¹⁷ If your situation might fit, talk to a lawyer well before that two-year clock runs out.

1
Office of the Law Revision Counsel. 39 USC 101 – Postal Policy
2
Oregon Public Broadcasting. Six-Days-a-Week Mail Delivery Saved; Biden Signs Postal Bill
3
USPS.com FAQs. Mail Service Alerts and Updates
4
United States Postal Service. U.S. Postal Service Releases Dog Bite National Rankings
5
U.S. Postal Service. Postal Bulletin 22625
6
USPS. DMM 508 Recipient Services – Section: Clear Approach
7
USPS About. Postal Service Seeks Help Keeping Access to Mailboxes Clear of Snow
8
United States Postal Service. How to Install a Mailbox
9
Office of the Law Revision Counsel. 28 USC 2680 – Exceptions
10
Supreme Court of the United States. United States Postal Service v. Konan, No. 24-351
11
Office of the Law Revision Counsel. 18 USC 1701 – Obstruction of Mails Generally
12
Office of the Law Revision Counsel. 18 USC 1703 – Delay or Destruction of Mail or Newspapers
13
Office of Inspector General OIG – USPS OIG. Investigative Work
14
USAGov. How to File a U.S. Postal Service Complaint
15
USPS OIG. File an Online Complaint
16
Postal Regulatory Commission. PRC Issues Final Rules for Complaints and Rate or Service Inquiries
17
General Services Administration (GSA). Claim for Damage, Injury, or Death (Standard Form 95 Instructions)