by Ravi Backerdan on December 15, 2025
Alright, let’s be honest for a second—there’s nothing more frustrating than paying for printing, postage, design… only to have half your mail pieces come back as undeliverable or just disappear into the postal abyss. It’s like throwing money straight out the window.
That’s where CASS™ Certification steps in.
If you’ve ever wondered what CASS is, or why everyone in direct mail talks about CASS-certified addresses, here’s the simplest explanation:
It’s basically the USPS® system that checks, fixes, and standardizes mailing addresses so your mail gets exactly where it’s supposed to go. Not nearby. Not close-ish. Not “sort of in the right ZIP.”
It gets delivered.
And Amerilist handles all of it for you—so you don’t have to stress about address accuracy or constantly wonder why your mailing list is failing you.
Think about your mailing list for a sec.
Has it ever actually been checked? Cleaned? Verified?
A lot of businesses don’t realize how many incomplete, old, or just flat-out wrong addresses they’re using until the money’s already gone.
With Amerilist’s CASS certification service, your mailing list is fully prepared for USPS delivery standards.
Our CASS process:
Basically, we clean up your list so the USPS looks at it and goes, “Oh yeah, this is perfect—send it through.”
This part hurts, but it’s true:
When you don’t use CASS-certified addressing, you’re paying for:
With Amerilist’s CASS Address Verification, you avoid all of that.
Oh, and here’s the fun part: Using our CASS system may even qualify you for USPS postage discounts.
Yeah—clean data saves money before and after the campaign.
When you rent or buy a mailing list from Amerilist, you’re not hoping it’s accurate…
It already is.
Every address in our compiled and managed lists is:
So whether you're buying:
You’re getting data that’s actually deliverable.
People ask this a lot:
“Can I do CASS certification myself with software?”
Technically yes, but CASS software is… kind of its own beast.
You need approvals, updates, USPS compliance, and monthly maintenance—it’s not a “click and fix” kind of thing.
Most businesses just let Amerilist handle the CASS processing because:
If you want to do it yourself, sure.
If you want it done correctly? Call us.
Whether you're doing:
CASS certification ensures your message gets to the right address the first time.
No rerouting, no missing units, no “this person hasn’t lived here since 2017.”
Our Data Processing Team can run your file through CASS, NCOA, and everything else needed to ensure your mail campaign runs smoothly and is deliverable.
Call 1-800-457-2899
Perfect addresses = better campaigns.
Let us fix your list before you print a single envelope.
It’s the USPS address accuracy standard. It checks, corrects, and formats mailing addresses so your mail is deliverable.
An address that has been verified, standardized, and approved using the USPS CASS system.
Absolutely. If you want your mail to actually arrive and not blow your budget, yes.
Yep! Clean addresses = USPS discounts. It’s a win-win.
Yes—our compiled lists are CASS-certified, and we offer CASS processing for your internal lists too.