Nail and mail service in NY, authorized by CPLR 308(4), lets you serve a summons on an individual defendant by securely affixing it to the door of their home or workplace and mailing a second copy, but only after you have genuinely tried and failed to serve them in person or through a responsible adult at the same location. It is a fallback method, not a shortcut, and New York courts examine 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 deliberate order. Nail and mail sits fourth. Two higher-priority methods must prove unworkable before you can use it.
The first is personal delivery under CPLR 308(1): the server hands the summons directly to the defendant anywhere in New York State. The second is 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, then mails a second copy to the defendant, with the delivery and mailing happening within 20 days of each other.
Only after attempting both of these with “due diligence” and failing does 308(4) become available. Skipping straight to the door without documented attempts at the first two methods leaves any resulting judgment open 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. Certain patterns consistently satisfy or fail the standard.
Servers who succeed typically make 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 across different time windows is a common benchmark, though quality matters more than count. Two well-timed visits to the home and the workplace can outweigh six Tuesday-afternoon trips to the same door.
Courts also expect the server to try both a known home address and a known workplace when both are available. Going to one location repeatedly while ignoring the other raises a red flag. The server should make reasonable inquiries about the defendant’s whereabouts, such as asking a neighbor or building manager when the person is typically around. An affidavit that reads like a genuine investigation will survive a motion to dismiss; one that reads like a checklist exercise often won’t.
The Two Physical Steps
Once due diligence is satisfied, two acts must both happen, and they must happen within 20 days of each other.
Affixing the Summons
The server securely attaches a copy of the summons and complaint to the door of the defendant’s home, usual residence, or workplace. The statute requires that this location 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 won’t fall off before the defendant returns.
Mailing the Summons
The server mails a second copy to the defendant. The statute gives two mailing options with different rules.
If the mailing goes to the defendant’s last known residence, no special envelope markings are required. This is the simpler option and the one most commonly used.
If the mailing goes 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. These restrictions protect the defendant’s privacy at work, and skipping the “personal and confidential” label or using law-firm letterhead on the envelope can invalidate the service entirely.
Both the affixing and the mailing must be completed. Doing one without the other, or letting more than 20 days pass between them, renders the service defective.
Filing Proof and When Service Becomes Effective
After completing both physical steps, 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 server affixed the summons on June 1 and mailed the copy on June 5, the affidavit must be filed 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 with the court. This built-in waiting period gives the defendant extra time to receive and review the papers before any legal deadlines start running. The clock on the defendant’s response time does not begin until that 10-day period expires.
When the Defendant’s Answer Is Due
Because nail-and-mail service carries a greater risk that the defendant won’t see the papers right away, New York gives these defendants more time to respond than those 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 in the action. CPLR 3012(c) likewise provides 30 days to serve an answer when the complaint was not personally delivered to the defendant.
The full math: if proof of service is filed on June 10, service is complete on June 20, and the defendant’s answer is due by July 20. Miscalculating this sequence is a common source of improperly entered 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 a defendant’s door and mail the copy 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. 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: insufficient due diligence before resorting to nail and mail, failing to complete both the affixing and the mailing, missing the 20-day window between the two steps, and filing the proof of service late.
If the defendant never appears and the plaintiff obtains a default judgment, the defendant can later move to vacate that judgment 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 told 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 lost entirely. 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 better strategy.
When Nail and Mail Isn’t Enough
Sometimes even nail and mail proves impracticable. The defendant may have no known New York address, or a building may be inaccessible. CPLR 308(5) covers this situation by allowing the plaintiff to ask the court, by motion, to authorize a different method of service. The motion can be made without giving the defendant advance notice, and the court has broad discretion to craft a method reasonably calculated to reach the defendant. In modern practice this has included service by email and even social media where the plaintiff can show those channels are likely to provide actual notice.
A 308(5) motion requires the plaintiff to demonstrate 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 the server made a few unsuccessful trips. 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 lawsuit by following the service rules of the state where the federal court sits or where service is made. In a federal case filed in any of New York’s federal districts, a plaintiff can use CPLR 308(4) nail-and-mail service, provided all of New York’s requirements are met. The due diligence standard, the 20-day windows, the mailing restrictions, and the proof-of-service filing rules all apply exactly as they would in state court.