New York CPLR § 308(1), (2) & (4) ("Nail and Mail" Due Diligence & Mandatory 20-Day Mailing/Filing Window)

Section 1: New York CPLR § 308(1), § 308(2), § 308(4) & RPAPL § 735 Comparison Matrix

New York’s CPLR § 308 creates a strict hierarchy for serving a summons on a natural person within the overarching 120-day service deadline after filing (CPLR § 306-b). Confusing the prerequisites for suitable-age service (§ 308(2)) with “Nail and Mail” affix-and-mail service (§ 308(4))—or missing the mandatory 20-day mailing and proof-of-service filing window—is a leading cause of dismissals in New York Supreme and Civil Courts.

Section 2: Step-by-Step Execution of the 20-Day Mailing & Filing Rule Under CPLR § 308(2) and § 308(4)

Both CPLR § 308(2) (leave and mail) and CPLR § 308(4) (affix and mail) require a two-step physical act followed by a strict 20-day court filing deadline:

1. Step 1A — Delivery to a Person of Suitable Age and Discretion (CPLR § 308(2)): New York CPLR § 308(2) does not require prior unsuccessful attempts before serving a person of suitable age and discretion at the defendant’s actual place of business, dwelling place, or usual place of abode. A co-resident, office receptionist, or building doorman who denies elevator access (F.I. duPont, Glore Forgan & Co. v. Chen) qualifies so long as they lack an adverse interest to the defendant. Note: Under NY Domestic Relations Law (DRL) § 232(a), divorce actions require personal in-hand delivery (CPLR § 308(1)) unless the plaintiff first obtains a signed court order!
2. Step 1B — “Due Diligence” Prerequisite Before Affixing to the Door (CPLR § 308(4)): Service under CPLR § 308(4) (“Nail and Mail”) may be used only where service under paragraphs (1) and (2) cannot be made with due diligence. New York Appellate Division precedent requires at least three to four genuine attempts at the defendant’s verified dwelling place on different days of the week across non-working hours (early morning before 8:00 AM, evening after 6:00 PM, and Saturday), plus genuine inquiry to ascertain whether the defendant has a known actual place of business where personal or § 308(2) service could be made.
3. Step 2 — The Mandatory 20-Day Plain-Envelope First-Class Mailing: Within 20 days of either delivering the summons under § 308(2) or affixing it to the door under § 308(4), a copy of the summons must be mailed by first-class mail to the person to be served at their last known residence or actual place of business in an envelope marked “personal and confidential” that shall not indicate on the outside thereof, by return address or otherwise, that the communication is from an attorney or concerns an action against the person to be served.
4. Step 3 — Filing Proof of Service Within 20 Days & the 10-Day Completion Clock: Proof of service must be filed with the clerk of the court (via NYSCEF in e-filing counties) within 20 days of either the delivery/affixing or the mailing, whichever is effected later. Service is deemed complete 10 days after such filing, and the defendant has 30 days after completion to answer (CPLR § 320(a)).

Section 3: Fatal CPLR § 308 Failure Modes That Void Service

Defense attorneys in New York defeat default judgments and win motions to dismiss by spotting four common CPLR § 308 defects:

• Clustered Weekday Daytime Attempts (Failed Due Diligence): In Estate of Waterman v. Jones, 46 A.D.3d 63 (2d Dep’t 2007), the Appellate Division held that three attempts made during normal weekday working hours—coupled with zero effort to inquire about the defendant’s employment or attempt workplace service—fail to satisfy CPLR § 308(4) due diligence as a matter of law.
• Violating the “Personal and Confidential” Envelope Rule: Mailing the follow-up copy under CPLR § 308(2) or § 308(4) in an envelope bearing a law firm’s return address or omitting “Personal and Confidential” invalidates service (Pesner v. H.M.S. Direct Mail Serv., Inc.).
• Affixing to an Outer Building Lobby Door Instead of the Apartment Door: If a server gains entry to a multi-unit building, the summons must be affixed to the defendant’s specific apartment door unless the inner vestibule is locked and inaccessible across diligent attempts.
• Late Filing Past the 20-Day Window: While late filing past the 20-day window is a procedural irregularity curable under CPLR § 2001 / § 2004, a plaintiff cannot enter a default judgment on a late-filed affidavit without court order, and the 30-day answer clock does not begin until 10 days after curative filing.

Section 4: Court-Ready CPLR § 308 Affidavit of Service & Due Diligence Log

Every CPLR § 308(2) or § 308(4) Affidavit of Service issued by Executive Process Service documents:

• Each prior personal attempt with exact date, time (morning, evening, Saturday), GPS coordinates, and DCWP license number (for NYC serves);
• Inquiries made to neighbors or building staff confirming residency and checking for employment;
• Compliance with the plain white envelope marked “Personal and Confidential” with no attorney indicia; and
• Immediate PDF transmission for NYSCEF e-filing within the 20-day statutory window.

Section 5: Statutory Edge-Case Q&A on CPLR § 308 Service

Q1: What is the difference between CPLR § 308(4) “Nail and Mail” and RPAPL § 735 Conspicuous Place Service?

In a civil action under CPLR § 308(4), the server must satisfy strict “due diligence” (3–4 attempts + workplace inquiry), mail by first-class mail within 20 days, and file within 20 days. In an eviction proceeding under RPAPL § 735, the standard is “reasonable application” (at least 2 attempts across working and non-working hours), followed by mailing via both authenticated/registered mail and regular first-class mail within 1 day, and filing proof within 3 days.

Q2: Can a New York Divorce Summons be served by “Nail and Mail” under CPLR § 308(4)?

Not without a prior court order. Under NY Domestic Relations Law § 232(a), matrimonial divorce actions require personal in-hand delivery (CPLR § 308(1)) unless a judge signs an order authorizing alternative service.

Q3: What if the 120-day CPLR § 306-b deadline to serve the Summons is about to expire?

Select our Same-Day Emergency Dispatch ($195) on the online order page so assigned servers can execute immediate personal or CPLR § 308(2) service before your 120-day window closes.