USPS Mailing Guides

USPS Certified Mail Forms Guide: Which Form You Need

Use this overview to figure out which USPS certified-mail form you need, when each form appears in the workflow, and when to use the dedicated PS Form 3800 or PS Form 3811 guides.

How to Address a Letter (2025): 10 Common Mistakes to Avoid & USPS Rules

Avoid the 10 letter addressing mistakes that delay or return your mail. Follow USPS-approved formatting, abbreviations, and positioning rules for 2025.

How Long Does USPS Mail Take? First-Class Delivery Times by Class (2026)

USPS First-Class Mail takes 1–5 business days: 1–2 days local, 2–3 days regional, 3–5 days cross-country. See delivery times by state and service class (2026).

Add Apartment Number After Mailing: USPS Missing Unit Recovery Guide

Already mailed something without the apartment or unit number? Learn the best USPS recovery options, what can still be fixed, and how to handle missing-unit mail in 2026.

Apt vs Unit vs Suite: USPS Secondary Address Format Examples

Use this guide before mailing when you need the right apartment, unit, suite, or floor abbreviation and placement. Includes USPS-friendly examples for secondary address formatting.

How to Use ATTN (Attention) on Mail

Authorization Letter: Free Template + How to Write One That Works

An authorization letter lets someone act for you - pick up mail, sign documents, claim a package. Free template and writing guide for 2026.

Best USPS Service for Mailing Important Documents (2025 Guide)

Compare Certified Mail, Priority Mail, Registered Mail & First-Class for mailing important documents. Learn the best way to mail important documents with USPS based on cost, speed, tracking, and proof of delivery.

Best USPS Service for Mailing Important Documents Internationally (2025)

Compare USPS international services for sending important documents: First Class, Priority Mail, Express, and Registered Mail. Find the best option for legal papers, contracts, and business documents.

What to Do About a Broken Mailbox: Repair, Replace & USPS Rules (2025)

Is your mailbox broken, damaged, or vandalized? Learn who

Can FedEx Deliver to a PO Box? FedEx PO Box Rules Explained (2025)

Can FedEx deliver to a PO Box address? Learn FedEx PO Box delivery rules, why FedEx can

Does UPS Deliver to a PO Box? No — Here's What to Do Instead

UPS cannot deliver to a USPS PO Box. Use a UPS Store mailbox, street address PO Box, or have packages held at a UPS Access Point. Full guide for 2026.

How to Cancel USPS Mail Forwarding (2025 Guide)

Need to cancel USPS mail forwarding? Learn how to stop mail forwarding, return mail to your original address, or update your forwarding order.

Certified Letter from IRS: What It Means & How to Respond

Received a certified letter from the IRS? Learn what it means, how to respond properly, and how to send certified mail back to the IRS online.

Certified Mail Price 2026: $5.30 USPS Fee + Postage

How Does Certified Mail Work? A Step-by-Step Guide

Learn how USPS Certified Mail works online (requirements, tracking, delivery confirmation) plus in-person options.

How to Track Certified Mail: Complete 2026 Methods Guide

Use this guide when you have the tracking number and need the normal USPS tracking steps, status meanings, and delivery-proof workflow.

Certified Mail vs Priority Mail (2026): Speed, Security & Use Cases

Use Certified Mail when you need mailing proof or delivery records. Use Priority Mail when speed, tracking, and package delivery matter more.

Certified Mail vs Registered Mail for Valuables and Sensitive Documents (2026)

Use this guide when you need to choose between cheaper proof of delivery and maximum chain-of-custody protection for valuables, originals, and high-risk documents.

Certified Mail vs Return Receipt - What's the Difference?

Learn the key differences between Certified Mail service and Return Receipt add-on. Understand when you need proof of delivery vs proof of mailing for legal documents.

Certified vs Registered Mail for Legal Notices (2025 Guide)

Certified vs registered mail for legal notices: Compare USPS services for demand letters, court documents, and proof of service. Learn which option is right for you.

PS Form 3575: File a USPS Change of Address in Person for Free (2026)

Use this guide for the PS Form 3575 workflow at the Post Office. Learn where to get the form, how USPS verifies ID, and when this free in-person option beats filing online.

How to Declare Documents on USPS Customs Forms (2025 Guide)

Learn how to correctly declare documents and correspondence on USPS customs forms for international mail. Step-by-step instructions for PS Form 2976 and 2976-A.

Is There Mail Today? USPS Delivery Checker

Check whether USPS is delivering today, including Sundays, federal holidays, and local service alerts. Use this 2026 guide for same-day mail status.

Does Certified Mail Require a Signature? Who Can Sign (2026)

Yes — USPS Certified Mail requires a signature on delivery. Any adult at the address can sign unless Restricted Delivery is added. 2026 rules explained.

Does USPS Deliver on Saturdays? Yes — Here's What & When (2026)

Yes, USPS delivers Saturdays. Priority Mail, Priority Mail Express, First-Class packages, and Amazon ship Sat. No regular First-Class letters. Hours inside.

USPS Electronic Return Receipt: How the Email Proof of Delivery Works

Learn when to use USPS electronic return receipt, how the emailed PDF proof of delivery works, and when it makes more sense than the green card.

Email → Snail Mail (USPS)

Convert an email to physical mail: what it is, common uses, how to format, and USPS options like Certified and Electronic Return Receipt (ERR).

How to Extend USPS Mail Forwarding (2025 Guide)

Need to extend USPS mail forwarding beyond 12 months? Learn about USPS Extended Mail Forwarding, Premium Forwarding Service, costs, and alternative options.

USPS First-Class Mail International Explained: Delivery Times, Customs & Limits (2026)

Learn when USPS First-Class Mail International works for letters, flats, and lightweight items, including delivery windows, customs rules, weight limits, and when to upgrade.

USPS First-Class Mail Explained: Delivery Time, Weight Limits & Add-Ons (2026)

Learn what USPS First-Class Mail includes, how long it takes, its weight and size limits, tracking add-ons, and when to use it. Need the exact 2026 stamp price chart? See USPS postage rates.

First-Class Mail vs Priority Mail: Which USPS Service Fits the Job? (2026)

Compare USPS First-Class Mail and Priority Mail by delivery speed, weight limits, tracking, and insurance. This page is about service choice, not the full stamp-price chart.

How to Fix a Wrong Address After Mailing: USPS Package Intercept Guide (2025)

Sent mail to the wrong address? Learn how to use USPS Package Intercept to fix an incorrect address after mailing, redirect packages, and prevent lost mail.

Forever Stamp Weight Limit: How Much Can You Mail? (2026)

Forever Stamps cover up to 1 oz for standard letters. Learn exact weight limits, what happens if you go over, and how to calculate the right postage for heavier mail in 2026.

How to Forward Mail for a Business

Learn how to forward mail for your business when relocating. Understand business COA requirements, processing times, and best practices.

How to Forward Mail for Someone Else (2025 Guide)

Need to forward mail for a family member, elderly parent, or someone else? Learn the legal requirements and step-by-step process.

How Late Does USPS Deliver?

USPS targets 5 PM but routes routinely run to 7-8 PM in peak season. 2026 guide to delivery hours, cutoff times, and what to do if mail is missing.

How Long Does Certified Mail Take to Deliver? USPS Times (2026)

Certified Mail takes 3–5 business days (First-Class) or 1–3 days (Priority). Same-city: 1–2 days. No Sunday delivery. Saturday yes. Updated 2026.

How Many Stamps Do I Need? USPS Stamp Calculator by Weight & Envelope Type (2026)

Use the USPS stamp calculator to figure out how many Forever or additional-ounce stamps to use by weight and envelope type. Need dollar postage rates instead? See 2026 USPS postage prices.

How Much Are Stamps in 2026? Forever Stamp Price + Full USPS Rate Chart

Forever stamps cost $0.78 in 2026, rising to $0.82 on July 12. Postcards $0.61, international $1.70, extra oz $0.29. Full USPS chart.

How to Address a Formal Letter: Greeting, Title & Sign-Off Guide

Learn how to address a formal letter to a person, department, judge, or business. Covers inside address format, salutations, title etiquette, and professional sign-offs.

How to Address a Letter to a Judge

Learn how to address a letter to a judge, format the envelope and salutation, avoid ex parte issues, and follow a sample judge letter format with clear guidelines.

How to Address a Letter to an Inmate

Learn how to address a letter to an inmate with the correct format, inmate ID, and facility address. Includes jail mail rules, content restrictions, and tips for successful delivery.

How to Address a PO Box on an Envelope (USPS Format)

PO Box format: Name on line 1,

How to Address Certified Mail: Complete Guide (2025)

Learn how to properly address certified mail envelopes. Step-by-step guide covering address format, return address placement, certified mail labels, and common mistakes to avoid.

How to Address Military Mail (APO/FPO/DPO) 2025: Complete Guide

Complete guide to addressing military mail with APO, FPO, and DPO addresses in 2025. Learn proper format, postage rates, restrictions, and delivery times.

Why USPS Returned Your Mail: 7 Fixes Before You Resend It

Use this troubleshooting guide when mail comes back with a USPS return code, address issue, or recipient problem. Learn what to fix before you resend it.

How to Get a PO Box (Step-by-Step Guide 2025)

Learn how to get a USPS PO Box step by step. Find requirements, costs, sizes, and how to sign up online or in person.

How to Keep Documents from Getting Bent in the Mail (2025 Guide)

Learn how to mail documents without bending or damage. Complete guide to rigid mailers, cardboard stiffeners, proper packaging, and USPS tips to protect certificates, photos, and important papers.

How to Mail a Check Safely

Learn how to mail a check safely with USPS using gel ink, security envelopes, Certified and Registered Mail, plus what to do if a check is lost or stolen.

How to Mail a Letter at the Post Office

Learn how to address an envelope, place the right stamp, and mail a physical letter at a USPS mailbox or Post Office. For online mailing, use our separate guide.

How to Mail a Letter Online (Step-by-Step)

Step-by-step guide to mailing a letter online. Learn your options (USPS, online services, virtual mailboxes), what files work, and how tracking works.

How to Mail a PDF Document Online

Need to mail a PDF but don

How to Mail Court Documents (2025 Guide)

Step-by-step guide to mailing court documents correctly. Learn filing requirements, service rules, certified mail procedures, and how to file proof of service.

How to Mail DMV Paperwork (2025): Title Transfers, Registration & License Renewals

Learn how to mail DMV documents safely. Step-by-step guide for title transfers, vehicle registration, license renewals, and getting proof of delivery for your DMV paperwork.

How to Mail an Eviction Notice (2025 Guide)

Step-by-step guide for landlords: how to serve an eviction notice by mail using certified mail. State requirements, mailing methods, and documentation tips.

How to Mail Financial Documents Safely (2025 Guide)

Learn how to mail financial documents securely. Complete guide to mailing tax forms, bank statements, checks, loan documents, and other sensitive financial papers with proper packaging and tracking.

How to Mail FOIA Requests (2025): Freedom of Information Act Request Guide

Learn how to mail a FOIA request to federal agencies. Step-by-step guide for Freedom of Information Act requests by mail, including addresses, what to include, and tracking your request.

How to Mail Important Documents: Complete Guide (2025)

Learn how to mail important documents safely. Step-by-step guide covering packaging, USPS services, tracking, and tips to protect legal, financial, and personal documents in the mail.

How to Mail IRS Identity Verification Documents (2025)

Learn how to mail identity verification documents to the IRS safely. Step-by-step guide for Form 14039, ID theft affidavits, and responding to IRS identity verification requests.

How to Mail IRS Payments Safely (2025): Check, Money Order & Payment Voucher Guide

Learn how to mail a payment to the IRS safely. Step-by-step guide for checks, money orders, Form 1040-V vouchers, and getting proof of payment with certified mail.

How to Mail Legal Documents Correctly (2025 Guide)

Complete guide to mailing legal documents properly. Learn which USPS service to use, how to create proof of delivery, and best practices for contracts, court papers, and official notices.

How to Mail Medical Records Safely (2025 Guide)

Learn how to mail medical records securely and in compliance with privacy guidelines. Step-by-step guide covering HIPAA considerations, packaging, USPS services, and tips for patients and providers.

How to Mail a Notice of Intent to Sue (2025 Guide)

Step-by-step guide to mailing a notice of intent to sue (pre-litigation letter). Learn what to include, proper mailing methods, and how this notice protects your legal rights.

How to Mail a Notice to Vacate (2025 Guide)

Step-by-step guide for tenants and landlords: how to properly mail a notice to vacate. Learn about 30-day notices, required service methods, and documentation for ending a lease.

How to Mail Passport Renewal Forms (2025): DS-82 Mailing Guide

Learn how to mail your passport renewal application (Form DS-82) safely. Step-by-step guide including mailing addresses, what to include, and how to track your application.

How to Mail a Rent Increase Notice (2025 Guide)

Step-by-step guide for landlords: how to properly mail a rent increase notice using certified mail. State requirements, notice periods, and documentation tips.

How to Mail School Transcripts Safely (2025 Guide)

Learn how to mail school transcripts securely. Step-by-step guide for sending official and unofficial transcripts to colleges, employers, and institutions with proper packaging and tracking.

How to Mail a Security Deposit Dispute Letter (2025 Guide)

Step-by-step guide for tenants: how to properly mail a security deposit dispute letter using certified mail. Includes deadlines, documentation tips, and sample language.

How to Mail Sensitive Documents Safely (2025 Guide)

Learn how to mail sensitive documents securely. Protect personal information, Social Security numbers, and confidential papers with proper packaging, USPS services, and privacy tips.

How to Mail Social Security Documents (2025)

Learn how to mail documents to Social Security safely. Step-by-step guide for SSA applications, benefit claims, appeals, and getting proof of delivery for important documents.

How to Mail Unemployment Documents (2025)

Learn how to mail unemployment documents safely. Step-by-step guide for appeals, weekly certifications, and supporting documents with proof of delivery.

How to Mail USCIS Documents Safely (2025)

Learn how to mail documents to USCIS safely. Step-by-step guide for immigration forms, supporting evidence, RFE responses, and getting proof of delivery with tracking.

How to Print Address Labels from Excel (Easy Mail Merge Guide)

Step-by-step guide to creating and printing address labels from Excel using Microsoft Word mail merge.

How to Print Without a Printer: Mail Letters Online

No printer at home? Learn simple ways to print and mail letters online—what files work, how addressing works, and delivery options.

How to Prove You Mailed Something (2025 Guide)

Complete guide to proving you mailed a letter or document. Learn about certified mail receipts, return receipts, certificates of mailing, and what evidence courts accept.

How to Send a Demand Letter by Mail (2025 Guide)

Step-by-step guide to mailing a demand letter with certified mail. Learn the best way to send demand letters for debt collection, contract disputes, and legal claims with proof of delivery.

How to Send an Eviction Notice

Learn how to properly send an eviction notice to tenants, including required delivery methods, certified mail options, timelines, and legal requirements by state.

How to Send a Letter Internationally in 2025: Complete Guide

Complete guide to sending international mail in 2025. Learn USPS international rates, customs forms, addressing requirements, and delivery times worldwide.

How to Serve Someone Using Certified Mail (2025 Guide)

Step-by-step guide to serving legal documents by certified mail. Learn when certified mail service is allowed, proper procedures, and how to document service for court.

How to Write a Certified Letter in 2025 (With Template)

Step-by-step guide on how to write a certified letter for USPS. Includes a sample letter, formatting tips, and how to send it online.

How to Write an Address on a Letter (USPS Format)

Learn the correct USPS address format for envelopes and letters. See examples for sender and recipient addresses, ZIP+4 tips, and common mistakes to avoid.

Is USPS Still the Best Way to Mail a Letter?

We break down whether USPS is still the best way to send mail in 2025 — and when online mailing is faster, easier, and more convenient.

How to Keep Mail Safe From Theft: Complete Protection Guide (2025)

Protect your mail from package thieves and mailbox theft with these proven strategies. Learn about USPS security services, locking mailboxes, and delivery options.

Landlord Letter Templates: Send Professional Notices to Tenants

Free landlord letter templates for rent reminders, lease violations, maintenance notices, and more. Download or send online with proof of mailing.

How to Mail a Letter Online: The Complete 2026 Guide

Learn how to mail a letter online without a printer or post office trip. This step-by-step guide explains your options and shows you how to use our online mailing tool.

Mail Delivered to Wrong Address? What to Write & Do (2026)

Got mail for the wrong address? Write

How Long Does USPS Mail Forwarding Last?

Complete guide to USPS mail forwarding timeframes, renewal options, and costs. Learn the difference between temporary and permanent forwarding in 2025.

USPS Mail Forwarding Not Working? Here's How to Fix It (2025)

USPS mail forwarding not working? This 2025 troubleshooting guide explains common forwarding problems and step-by-step fixes to get your mail delivered.

What is a Mail Scanning Service?

How mail scanning works, typical costs, security, and whether digital mail is right for you—neutral, non-transactional guide updated for 2025.

Mailing Evidence for Small Claims Court (2025 Guide)

Complete guide to mailing documents and evidence for small claims court. Learn how to serve the defendant, file with the court, and organize your evidence for trial.

Send Certified Mail Online (USPS)

Send USPS Certified Mail online—upload your letter, we print, add Certified + return receipt, and mail it today. Pricing, delivery times, and step-by-step 2025 guide.

How to Track Your Passport: Application, Status, and Delivery (2026)

Track your passport in 3 steps: (1) USPS tracking for what you mailed, (2) State Dept status check, (3) USPS tracking for the delivery back. 2026 guide.

PO Box Alternatives in 2026: 5 Better Options Compared

Virtual mailboxes ($10-30/mo), UPS Store boxes ($20-40/mo), CMRAs, and coworking compared. Pricing, real street addresses vs. PO Boxes. Pick the right fit.

How Much Does a PO Box Cost? USPS, UPS & Virtual Mailbox Prices (2026)

USPS PO Box costs typically run $10–$30/month for small boxes in most markets. UPS Store mailboxes run higher. Compare all three options with pros, cons, and hidden fees.

PO Box vs Home Address for Mail and Business (2026)

Compare using a PO Box versus your home or street address for privacy, business mail, package delivery, and cost. This page is about choosing between them, not PO Box formatting.

Postal Holidays 2025: Is Today a Postal Holiday?

Check if today is a postal holiday in 2025. Complete list of mail holidays, post office closures, and USPS holiday schedule to avoid delivery delays.

How to Prevent Address Errors on Mail: Complete USPS Address Guide (2025)

Avoid mail returns and delivery failures with this guide to preventing address errors. Learn USPS address formatting, validation tools, and common mistakes to avoid.

How to Print and Mail Documents Without a Printer

Discover how to print documents online, find a print shop near you, or mail letters from home using tools like 8.5 by 11 paper, white mailboxes, and spiral binding machines.

How to Send Priority Mail International (USPS Guide 2025)

Complete guide to USPS Priority Mail International: rates by country, delivery times, flat rate boxes, tracking, insurance, and step-by-step mailing instructions.

Priority Mail vs Priority Mail Express: 1–3 Days vs Overnight (2026)

Priority Mail = 1–3 days, no guarantee. Priority Mail Express = overnight, money-back guarantee, ~2–3× the cost. See exact 2026 rates and which to pick.

PS Form 2976 (CN 22): Short Customs Form for Lower-Value International Mail

PS Form 2976 is the short CN 22 customs form for lower-value international mail. Learn when to use it, what goes on the label, and when USPS requires PS Form 2976-A instead. (2026)

PS Form 2976-A (CN 23): USPS Long Customs Declaration (2026 Guide)

How to fill out PS Form 2976-A (CN 23) — the long USPS customs form for higher-value international packages and multiple items. Step-by-step. (2026)

PS Form 2976-B: USPS Customs Form for Priority Mail Express International (2025 Guide)

Complete guide to PS Form 2976-B, the customs declaration form specifically required for Priority Mail Express International shipments. Learn when to use it and how to fill it out.

PS Form 3665: Certificate of Mailing Explained

Learn what PS Form 3665 (Certificate of Mailing) is, when to use it, how to fill it out, and how it differs from certified mail. Step-by-step guide with FAQs.

How to Fill Out PS Form 3800 (Certified Mail Receipt)

Learn how to fill out PS Form 3800, the USPS Certified Mail Receipt. Includes step-by-step instructions, barcode explanation, fees, examples, and common mistakes to avoid.

How to Fill Out PS Form 3811 (Green Card)

How to fill out PS Form 3811 (USPS Return Receipt / Green Card) — sample, mistakes to avoid, and how to get one. (2026)

PS Form 3849: USPS Redelivery Notice — What to Do If You Got One

Got a PS Form 3849? It means USPS attempted delivery and you can either schedule redelivery online or pick up your package. Updated for 2026.

PS Form 3877: Firm Mailing Book for Accountable Mail

Learn how to fill out USPS PS Form 3877 (Firm Mailing Book for Accountable Mail) for batch certified mail, registered mail, and bulk accountable mail. Step-by-step instructions with examples.

What is Registered Mail? USPS Registered Mail Explained (2026)

Registered Mail costs $17.50 + postage and includes insurance up to $50,000 with chain-of-custody tracking at every step. See how it compares to Certified Mail and when to use each (2026 USPS rates).

USPS Registered Mail Forms and Labels Guide (Label 200 & PS Form 3806)

Complete guide to USPS registered mail forms including Label 200, PS Form 3806, and preparation requirements. Learn how to prepare and mail registered mail correctly.

How to Send Mail Back to Sender With USPS (2026)

Use this guide when unwanted mail arrived at your address and you need the sender-side steps. Learn what to write on the envelope, when postage is required, and which mail can be refused.

USPS Return to Sender: Meaning & Timeline

How to Secure Mail in Apartment Buildings: Complete Protection Guide (2025)

Protect your mail in apartment complexes with locking mailboxes, package lockers, and security tips. Learn how to prevent theft in multi-unit buildings.

What Counts as "Service by Mail" in Legal Terms (2025 Guide)

Understand what legally counts as service by mail for legal documents. Learn about proper mailing methods, proof requirements, and when mail service is acceptable vs. personal service.

Snail Mail Letters: What They Are and How to Send One Online in 2025

Snail mail still matters in 2025. Learn what snail mail is, why people use it, and how to send physical letters online starting under $5 without going to the post office.

Snail Mail Meaning: What It Is, Where the Term Came From & Why It Still Matters

Snail mail is a slang term for physical postal mail — letters and postcards delivered by USPS. Here is what it means, where it came from, and why people still use it.

Someone Else Getting Your Mail? How to Fix Misdelivered Mail (2025)

If your mail is going to someone else

How to Stop Mail for Previous Residents: Complete Guide (2025)

Getting mail for people who used to live at your address? Learn how to stop receiving mail for previous residents, return it properly, and protect yourself.

Temporary vs Permanent Change of Address: Which Should You Choose?

Should you file a temporary or permanent USPS Change of Address? Learn the differences, durations, and which option is right for your situation.

How to Track Certified Mail When You've Lost Your Receipt or Tracking Number

Lost your certified mail receipt or tracking number? Use this recovery guide for the USPS lookup options, bank-record workaround, and next best steps.

How to Update Recipient Address Before Delivery: USPS Redirect Guide (2025)

Need to change the delivery address on a package already in transit? Learn how to update the recipient address before USPS delivers using Package Intercept.

USPS "Addressee Unknown": What It Means & How to Fix It (2026)

USPS Ancillary Endorsements Explained (2025): Forwarding, Returns & Address Corrections

Complete guide to USPS ancillary endorsements including Return Service Requested, Address Service Requested, Do Not Forward, and Change Service Requested. Learn how each endorsement affects mail forwarding, returns, and fees.

USPS "Arrived at Post Office" Explained: What It Means (2025)

USPS tracking shows

USPS Arriving Today But Not Out for Delivery? What It Means (2026)

USPS Certified Mail: How It Works (2025 Guide)

Learn what USPS Certified Mail includes, how tracking and return receipts work, typical delivery timeframes, and common use cases.

USPS Change of Address (COA) Guide 2025: How to File, Fees, & Forwarding Rules

Complete guide to USPS change of address (COA) in 2025. Learn how to file online or in person, understand temporary vs permanent forwarding, fees, timelines, and what mail types are forwarded. Includes PS Form 3575 walkthrough and troubleshooting tips.

USPS "Delivered" But No Package: What to Do (2025 Guide)

USPS tracking says

USPS First Class Mail Delivery Time: How Long Does It Take? (2026)

USPS First-Class Mail typically delivers in 1-5 business days. Learn exact delivery times by distance, what affects speed, and when to expect your mail in 2026.

USPS "Forwarded" Meaning: What It Means for Your Mail (2025)

USPS tracking shows

USPS General Delivery: How It Works, Address Format, and Hold Times

Learn how USPS General Delivery works, who can use it, address format, hold times, package rules, and how to pick up mail at a participating post office.

USPS “Held at Post Office” Meaning: How to Pick It Up (2026)

USPS Hold Mail: Pause Delivery While You're Away

USPS Hold Mail pauses delivery 3-30 days at your local Post Office. Free, online, requires ID verification. 2026 scheduling and eligibility guide.

USPS Holidays 2026: Post Office Closures & No-Mail Days

Complete list of USPS holidays 2026 when post offices are closed and mail isn

C/O (In Care Of) vs ATTN: When to Use Each on Mail

Learn when to use c/o vs ATTN on mail, plus the correct USPS c/o format, examples, and rules for sending mail through another person or business.

USPS "In Transit, Arriving Late" Meaning: What to Do (2025)

USPS tracking shows

USPS "Insufficient Address" Meaning: What to Do (2025)

USPS tracking shows

USPS International Delivery Times Explained (2025 Guide)

How long does international mail take? Complete guide to USPS international delivery times by service and country: First Class, Priority Mail, and Express International.

USPS International Tracking: Why It Stops Updating & What to Do (2026)

USPS international tracking often stops at customs or when it leaves the US — this is normal. Covers every status message, which services include tracking, and what to do if it\

USPS "Label Created, Not Yet in System": What It Means & How Long to Wait (2026)

USPS Missing Mail Search Request: How to File & What Happens (2026)

File a USPS missing mail search request in minutes — searches take 5-7 business days. Covers every status, what USPS investigates, reimbursement rules, and what to do if tracking says delivered.

USPS Mail Forwarding Guide: How to Start, Manage, and Extend Forwarding (2026)

Learn how USPS mail forwarding works, how to start a Change of Address, what mail gets forwarded, how long forwarding lasts, and how to manage or extend it. Need to stop forwarding? Use the separate cancel guide.

USPS "Notice Left" Meaning: What to Do (2025 Guide)

USPS tracking shows

USPS Operation Santa (2025 Guide): How It Works, Deadlines, and How to Adopt Letters

Learn how USPS Operation Santa works in 2025. This guide explains how to write letters, mail them, adopt letters, key deadlines, and how the program protects children

USPS "Out for Delivery" But Not Delivered: How Long to Wait & Next Steps (2026)

USPS tracking shows

USPS Pre-Shipment Meaning: What It Means and How Long It Lasts

USPS Pre-Shipment means the shipper printed a label but has not handed the package to USPS yet. Typically clears in 24–48 hours. Updated for 2026.

USPS "Receptacle Blocked" Meaning: Why Delivery Failed & How to Fix It (2025)

What does USPS

USPS Says Delivered But No Package? How to Report It to USPS (2026)

Use this guide after the first checks fail: contact your local Post Office, open a USPS Help Request, and file a Missing Mail Search when USPS shows delivered but no package appears.

USPS Signature Services Explained (2026)

Compare USPS signature services, including Signature Confirmation, Adult Signature, and Restricted Delivery. Need the Certified Mail rule specifically? Use our certified-mail signature guide.

USPS Tracking Not Updating: How Long to Wait & What to Do (2026)

USPS tracking not updating? Wait 5–7 days for First-Class, 7–10 for Priority before worrying. See what each stuck status means and when to file a search.

USPS "Unable to Deliver" Meaning: Why It Happens & What to Do (2025)

What does USPS

What Is First-Class Mail? USPS First-Class Mail Explained

First-Class Mail is USPS

What You Cannot Mail Internationally (USPS Prohibited Items 2025)

Overview of items prohibited in international mail by USPS. Learn what you cannot send abroad, country-specific restrictions, and consequences of mailing prohibited items.

Where to Mail Your 1040 Tax Return in 2026: IRS Address by State

Find the exact IRS address to mail your 1040 for 2026 by state. Covers 1040-SR, amended returns (1040-X), and payments — with and without a check.

Which USPS Customs Form Do You Need?

Compare PS Form 2976, 2976-A, and 2976-B customs forms. Decision tree and comparison table to choose the right USPS customs declaration for international mail.

Why Would You Get a Certified Letter? Common Reasons & What to Do (2025)

Certified letters come from the IRS, banks, courts, employers, and government agencies. Learn why you received one and how to respond properly.

ZIP Code Lookup: How to Find the Right ZIP Code for Any Address

Learn how to find the correct ZIP Code using USPS tools, understand ZIP+4 codes, avoid common mistakes, and prevent mail delays or returns.

ZIP+4 Code Format Guide: How to Use 9-Digit ZIP Codes

Clear, up-to-date guide to ZIP+4 format: what the 9-digit code means, when it helps, and how to look up the correct ZIP+4 for any address.