Postal Address Verification for Direct Mail Companies

In the direct mail business, your margins are tight and every undeliverable piece cuts directly into your profitability. So what’s the real cost when fifteen percent of your mail comes back as undeliverable?

It’s wasted postage. It’s wasted printing. It’s wasted labor. It’s angry clients who paid for delivery and didn’t get it. Every returned piece represents pure loss—money spent with zero return. And in a business where margins are measured in pennies per piece, fifteen percent undeliverable mail can be the difference between profit and loss.

How long have you been dealing with the stress of high undeliverable rates? Your clients expect professional results. They expect their message to reach the intended recipients. But when you’re working with their outdated mailing lists, you’re set up to fail before the mail even drops.

Think about the impact on your client relationships. When a client’s campaign underperforms because of poor deliverability, they don’t blame their list—they blame you. You’re the direct mail expert. You’re supposed to know how to maximize delivery. What does it do to your reputation when clients see high return rates on their campaigns?

And here’s the thing: undeliverable mail doesn’t just cost you money on that specific campaign. It damages your relationship with the postal service. High return rates can affect your postage discounts and your standing with USPS. What happens to your business if you lose access to bulk mail rates because of poor address quality?

Postal Address Verification Built for Direct Mail

Our postal address verification services are designed specifically for direct mail companies. We provide CASS-certified address validation, NCOA processing, and comprehensive address standardization to ensure maximum deliverability on every campaign you run.

What We Deliver

CASS Certification: We process your mailing lists through USPS-certified Coding Accuracy Support System validation, ensuring every address meets postal standards. Invalid addresses are flagged, and deliverable addresses are standardized to USPS specifications.

NCOA Processing: We run your lists through the National Change of Address database, updating addresses for recipients who have moved and flagging addresses that are no longer deliverable. Your mail reaches people at their current locations.

Address Standardization: We format addresses according to USPS standards, correcting abbreviations, adding ZIP+4 codes, and ensuring proper formatting. Standardized addresses qualify for the best postage rates and maximize deliverability.

Duplicate Removal: We identify and remove duplicate addresses, saving you money on printing and postage while improving your campaign metrics.

The Satisfaction of Maximum Deliverability

Imagine the feeling of satisfaction when you can guarantee your clients ninety-eight percent deliverability. No more anxiety about high return rates. No more explaining away poor performance. Just the confidence that comes from knowing your campaigns are reaching their intended recipients.

Your margins improve dramatically. Less wasted postage means more profit per campaign. Less wasted printing means better cost control. Better deliverability means happier clients who come back for repeat business. What would a five percent improvement in deliverability mean for your annual profitability?

Your client relationships strengthen. When your campaigns consistently deliver strong results, clients trust you with bigger projects and more frequent mailings. Your reputation as a reliable direct mail partner grows, and referrals increase.

And here’s something else: when you work with List57, you’re not just getting postal address verification. You’re getting access to our exclusive free merch program. High-quality, stylish, sporty merchandise that you’ll actually want to wear—absolutely free with your order. It’s the kind of unexpected value that makes working with us feel different.