Returned mail
Every undeliverable piece means paying for printing, supplies, postage and staff time, just to have it sent back.
USPS CASS™ Certified address validation software
Deliver accuracy. Eliminate waste. Power every communication.
MaxCASS Plus is the trusted address validation and correction solution used by leading organizations to keep data accurate, compliant and deliverable, every single time.
- CASS™ Certified
- DPV® · LACSLink® · SuiteLink®
- Batch + real-time
- USPS CASS™ CertifiedBacked by USPS certification
- DPV®, LACSLink®, SuiteLink®Integrated, not bolted on
- Millions of records per hourBlazing-fast batch processing
- U.S. & internationalValidation for global records
See it work
What CASS processing fixes in a single address
Unlike simple address checkers, MaxCASS Plus corrects typos, adds missing ZIP + 4 codes and formats every address to USPS standards.
Input address
1 MICROWSOFTREDMUND WA
- Street name misspelling corrected
- City name misspelling corrected
- Street suffix added
- ZIP Code added
- ZIP + 4 add-on added
- Identified as a business address
CASS-certified output
1 MICROSOFT WAYREDMOND WA 98052-8300
Business address
4–5%of all mail is undeliverable, by USPS estimates
Millionsof records processed per hour in batch mode
25+years of Anchor Software helping companies solve address problems
2 modesbatch for mailing lists, real-time for quick address lookups
The real cost of bad addresses
A wrong address costs a lot more than a stamp.
Addresses change, typos happen and customer details go stale fast. Multiply one wrong address by thousands of mailings and the costs spiral.
Extra fees
Certified, Priority and Express mail are expensive, especially when a wrong address means sending it again.
Missed opportunities
Customers miss important bills, reminders and offers, leading to frustration and lost business.
Compliance risks
Finance, healthcare, utilities and government have rules about mail delivery. Bad addresses can mean fines and upset regulators.
Staff hours
Someone has to fix problems, correct lists and resend letters, time taken away from more valuable work.
How it works
Simple steps, big results
MaxCASS Plus makes address verification easy, no matter your company's size or volume.
Input your list
Upload a customer database or spreadsheet, or connect straight from your CRM or billing system.
Verify every address
Each address is checked against official USPS data, catching typos, outdated addresses and wrong ZIP Codes.
Standardize & correct
Minor mistakes are fixed and formats updated, so every entry is ready for mail delivery.
Flag problem records
Addresses that can't be corrected are marked for review, follow-up or removal.
Export clean data
Download a verified mailing list, accurate and ready for printing and sending.
Key features
Everything you need for top-level address quality
CASS™ Certified accuracy
USPS certification for address matching and coding you can rely on for automation prices.
ZIP + 4 & standardization
Adds missing ZIP + 4 codes, fixes typos and formats every address consistently.
DPV®, LACSLink® & SuiteLink®
Confirm delivery points, convert changed rural-route addresses and append business suite numbers.
RDI™ option
Know whether each address is residential or business before you mail or ship.
Geographic data option
Add geographic data to your address records as an option.
Batch & real-time
Process millions of records per hour, or validate single addresses in real time at sign-up.
U.S. & international
Validate U.S. and international records for accurate communication worldwide.
Integrated MaxMover
Built-in certified NCOALink® interface for change-of-address updates with the MaxMover add-on.
Extensive reporting
User-friendly features and extensive reporting, with multi-platform support.
More than an address checker
Clean, USPS-compliant data, automatically
MaxCASS Plus connects to official postal data, verifies each record, corrects errors and enhances every entry with missing details. It integrates with enterprise systems or runs standalone, processing millions of records without slowing down.
- Fewer failed deliveries and returned mail
- Improved customer satisfaction
- Lowest possible postage rates and all eligible presort discounts
- Stronger analytics built on verified data
Who uses MaxCASS Plus
Wherever accurate addresses matter most
Government agencies
Official documents land where they should.
Banks & financial services
Statements and notices reach account holders.
Healthcare providers
Medical bills reach the right patient.
Utilities
Bills reach every service address.
Retailers
Offers and orders reach real customers.
Logistics companies
Deliveries arrive on time, the first time.
Statement processors
High-volume runs, standardized and discounted.
Marketers & bulk mailers
Campaign dollars reach deliverable addresses.
Data isn't just numbers. It's the foundation of trust.
An accurate address ensures a medical bill reaches a patient, a delivery arrives on time and an official document lands where it should. Every successful communication begins with correct data.
Resources
Download the product sheets
FAQ
Common questions
What is CASS certification?
CASS (Coding Accuracy Support System) is the USPS program that tests address-matching software for accurate ZIP Code, ZIP + 4, delivery point and carrier route coding. MaxCASS Plus is CASS Certified.
Can MaxCASS Plus validate addresses in real time?
Yes. Use batch mode for large mailing lists, or real-time mode for quick address lookups such as online sign-ups and new customer entry.
Does MaxCASS Plus support international addresses?
Yes. MaxCASS Plus validates both U.S. and international records.
See MaxCASS Plus with your own addresses
Book a free demo. We'll show address validation, correction and standardization on data like yours, and answer your questions on platforms, setup and pricing.