Nail and mail service in NY, authorized by CPLR 308(4), lets a plaintiff serve a defendant by affixing the summons to the door of the defendant’s home or workplace and mailing a second copy, but only after genuine, documented attempts at personal delivery and substituted service have failed. No court order is needed to use it, but courts scrutinize every step closely because a defendant may never actually see papers taped to a door.
What You Have To Try First
CPLR 308 lists service methods in a required order of preference. Nail and mail is the third option, not a shortcut.
- Personal delivery under CPLR 308(1): the process server hands the summons directly to the defendant anywhere in New York State.
- Substituted service under CPLR 308(2): the server leaves the summons with a person of suitable age and discretion at the defendant’s home, usual residence, or workplace, and then mails a second copy to the defendant. Delivery and mailing have to occur within 20 days of each other.
Only after attempts at both of these methods have failed with “due diligence” does 308(4) become available. Skipping straight to the door without documenting real efforts at the higher-priority methods leaves any resulting judgment vulnerable to being vacated.
What Due Diligence Actually Requires
The statute uses the phrase “due diligence” without defining it, so courts decide case by case whether the server tried hard enough. The New York Court of Appeals has declined to set a rigid formula, holding that the question depends on the facts of each situation. Even so, certain patterns of effort tend to satisfy the standard, and certain patterns tend to fail it.
Successful due diligence usually involves multiple visits at different times of day and on different days of the week, including at least one evening or weekend attempt when a working person would more likely be home. Three or four attempts spread across different time windows is a common benchmark, but quality matters more than raw count. Two well-timed visits to the defendant’s home and workplace can outweigh six trips all made on Tuesday afternoons.
Courts also expect the server to try both a known home and a known workplace when both are known. Going to one address repeatedly while ignoring the other raises a red flag. The server should make reasonable inquiries as well, such as asking a neighbor or building manager when the defendant is usually around. An affidavit that reads like a real investigation will survive a motion to dismiss; one that reads like a checklist often will not.
Affixing the Summons
Once due diligence is satisfied, the server securely attaches a copy of the summons and complaint to the door of the defendant’s home, usual residence, or workplace. The location must be within New York State. Taping papers to a door at an out-of-state address does not satisfy 308(4). The attachment should be conspicuous enough that someone approaching the door would notice it and firm enough that it will not blow away or fall off before the defendant returns.
Mailing the Summons
The server then mails a second copy to the defendant. The statute gives two options, each with different rules.
- Mail to the defendant’s last known residence: no special envelope markings are required. This is the simpler option and the one most commonly used.
- Mail to the defendant’s actual place of business: the envelope must be sent by first-class mail, must bear the words “personal and confidential,” and must not show any indication on the outside that it comes from an attorney or involves a lawsuit. No law-firm return address, no legal jargon, nothing that would signal litigation to a coworker or mailroom employee.
The envelope restrictions on business mailings exist to protect the defendant’s privacy at work. Skipping the “personal and confidential” label or using law-firm letterhead can invalidate the service.
Both the affixing and the mailing have to be completed within 20 days of each other. Doing one without the other, or letting the window lapse, makes the service defective.
Filing Proof and When Service Becomes Effective
After both physical steps are done, the server files an affidavit of service with the clerk of the court named in the summons. The filing deadline is 20 days from whichever step happened later. If the summons was affixed on June 1 and the copy mailed on June 5, the affidavit is due by June 25.
Service does not become legally effective the moment the papers hit the door or arrive in the mail. Under CPLR 308(4), service is complete 10 days after the proof of service is filed. That built-in waiting period gives the defendant time to receive and review the papers before response deadlines start running.
The Defendant’s Deadline To Respond
Because nail-and-mail service carries a greater risk that the defendant will not see the papers right away, New York gives these defendants more time to respond than defendants served by hand. Under CPLR 320(a), a defendant served under paragraphs two through five of section 308 has 30 days after service is complete to appear. CPLR 3012(c) likewise gives 30 days to serve an answer when the complaint was not personally delivered.
The math stacks: if proof of service is filed on June 10, service is complete on June 20, and the answer is due by July 20. Miscounting this sequence is a common source of default judgments.
Who Can Serve the Papers
CPLR Rule 2103(a) requires that the person serving papers be at least 18 years old and not a party to the lawsuit. A plaintiff cannot tape the summons to the defendant’s door and drop the copy in the mail personally. The server has to be someone else: a friend, a hired process server, or a sheriff or marshal.
In New York City, professional process servers face an additional layer of regulation. New York City Administrative Code Section 20-403 makes it unlawful to work as a process server or operate a process-serving agency in the city without a license. Process-serving agencies that assign work to individual servers must also be licensed. Outside New York City, no statewide licensing requirement exists, though the age and non-party rules still apply.
What Happens When Service Is Defective
Defective service under CPLR 308(4) means the court never acquired personal jurisdiction over the defendant. The most common defects are insufficient due diligence, failing to complete both the affixing and mailing steps, missing the 20-day window between them, and filing the proof of service late.
If the defendant never appears and the plaintiff obtains a default, the defendant can later move to vacate under CPLR 5015 on the ground that the court lacked jurisdiction. There is no time limit for raising a jurisdictional defect. A defendant who discovers a years-old judgment from a case they were never properly notified about can still challenge it.
For the plaintiff, a finding of defective service means starting over. If the statute of limitations has expired in the meantime, the right to sue may be gone. CPLR 306-b gives plaintiffs 120 days from filing to complete service, and a court can extend that deadline for good cause or in the interest of justice, but relying on an extension is risky. Getting the service right the first time is the safer path.
When Nail and Mail Itself Will Not Work
Sometimes even nail and mail proves impracticable. The defendant may have no known address in New York, or the building may be inaccessible. CPLR 308(5) covers that situation by letting the plaintiff move the court, without prior notice to the defendant, for an order authorizing a different method of service. The court has broad discretion to craft a method reasonably calculated to reach the defendant, and in modern practice that has included email and social media where the plaintiff can show those channels are likely to provide actual notice.
A 308(5) motion requires a showing that personal delivery, substituted service, and nail and mail are all impracticable. Courts will not grant it simply because nail and mail is inconvenient or because a few visits failed. The standard is genuine impracticability, not mere difficulty.
Nail and Mail in Federal Court
Federal Rule of Civil Procedure 4(e)(1) allows service on an individual in a federal case by following the service rules of the state where the federal court sits or where service is made. In any federal district in New York, a plaintiff can use CPLR 308(4), provided every New York requirement is met. The due diligence standard, the 20-day windows, the mailing restrictions, and the proof-of-service filing rules all carry over unchanged.