Check a CSV or Excel mailing list for duplicates, missing fields, ZIP and state errors, and stale-list risk before you print and mail.
Drop your CSV or Excel list here
or click to browse
.csv, .xlsx, or .xls - scanned locally, never uploaded
Your file is checked locally in your browser. It is not uploaded to MPA during the free scan. If you choose to request official cleanup or a mailing quote, you can securely send your file to MPA in the next step.
No file upload for the free scan
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Built by a print and mail production team
Scanning Your List
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Everything runs on your device. Nothing is uploaded.
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Records scanned
Potential duplicates
Bad / missing ZIPs
Missing names
Stale-list risk
PO boxes detected
Estimated waste before official cleanup
Wasted pieces
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% - % of planned pieces
Wasted budget at $/piece
$ - $
Based on the cost per piece you entered.
Sharpen this estimate (optional)
Your score and findings are already done. These three optional fields refine the waste estimate. Nothing is uploaded.
What we found
This free scan is a preliminary list-structure check. It is not official USPS CASS/NCOA processing. For production mail, MPA can run certified address cleanup before printing and mailing.
Please do not upload regulated data through this public form unless the proper agreement and secure intake process are in place. Contact MPA and we'll route the file appropriately. You can still send us the scan summary below and we will follow up to set up secure intake.
Expect a response within 1 business hour. Questions now? Call (863) 687-6945 or email [email protected].
Built by Mail Processing Associates, a print and mail production team that handles list cleanup, CASS and NCOA processing, printing, and USPS mailing under one roof. This page is a free, browser-based tool for mailing address verification and list cleaning, so you can find duplicates and bad addresses before you spend money on print and postage.
What this free mailing address verification scan checks
The scanner reads your CSV or Excel file in your browser and runs a structural review of every record. It is a fast first pass at list cleaning and bulk address verification, the same problems our production team looks for before a job goes to press.
Duplicate detection
Finds exact duplicate rows, repeated addresses, repeated name and address pairs, and multiple people at one household. Every duplicate is a piece you pay to print and mail twice.
Missing field check
Flags records missing a recipient name or company, a street address, a city, a state, or a ZIP code. Incomplete records often cannot be delivered and are not eligible for automation postage.
ZIP and state verification
Checks that each ZIP is a valid 5-digit or ZIP+4 format and each state is a real abbreviation, then cross-references ZIP against state to catch mismatches that signal a typo or a mislabeled record.
Stale-list risk
Uses how recently the list was mailed and cleaned to estimate how many records may now be undeliverable because people moved. Older, never-cleaned lists carry the most decay.
Wasted postage estimate
Combines duplicate rate, bad-ZIP rate, and stale-list risk into a wasted-pieces and wasted-budget range at the cost per piece you enter, so you can see the cost of mailing the list as is.
PO box and column detection
Counts PO box records and auto-detects your column layout, even when headers are capitalized or named differently, so the scan works on real-world exports without manual mapping.
What official cleanup adds
The free scan checks list structure. It does not confirm that an address is real or that the person still lives there. That is what certified cleanup does, and it is the step that actually protects your postage budget before a production mailing.
1.CASS address standardization. Each address is matched against the USPS database, corrected to standard format, validated as a real delivery point, and assigned a full ZIP+4. This is what makes a list eligible for the best automation postage rates.
2.NCOA move updates. Your list is run against USPS change-of-address records from roughly the last 48 months, so people and businesses that moved are updated to their current address instead of mailing to a vacancy.
3.Deduplication and householding. Genuine duplicates are merged and multiple contacts at one address can be combined into a single mail piece where that is what you want, cutting both print and postage.
4.Presort and barcoding. Once the list is clean, it is presorted and barcoded with the Intelligent Mail barcode to qualify for the lowest postage tier your mailing is entitled to.
5.Print and mail in one pass. Because MPA prints and mails in house, the cleaned list flows straight into production. One team owns the file from cleanup through the USPS drop.
Why bad list data wastes postage
In direct mail, you pay for every record on the list. Print cost and postage are charged whether or not the piece ever reaches a real mailbox. That makes the mailing list itself one of the largest hidden costs in a campaign, and a dirty list quietly inflates it.
The U.S. Postal Service estimates that roughly 14 percent of Americans move every year. A list that has not been cleaned in a year can therefore have a meaningful share of addresses that no longer reach the intended person. Add in duplicate records, missing apartment numbers, and simple typos, and an uncleaned list can waste a noticeable slice of a print and postage budget on mail that is returned or thrown away.
Certified cleanup reverses most of that. NCOA processing typically matches a high share of recent movers, and a CASS-standardized, deduplicated list delivers far more reliably than a raw export. Running address verification before you print is almost always cheaper than paying full freight to mail records that were never deliverable.
CASS and NCOA in plain English
CASS stands for Coding Accuracy Support System. It is the USPS standard for validating and standardizing addresses. CASS processing fixes formatting, confirms the address is a real mailable delivery point, and adds the full ZIP+4. Think of it as making sure the address, exactly as written, is correct and complete.
NCOA stands for National Change of Address. It compares your list against USPS move records and updates addresses for people and businesses that have relocated. Where CASS fixes the address on the page, NCOA follows the person who moved to their new address.
Most direct mail benefits from both. CASS makes the list eligible for the best automation postage and confirms deliverability. NCOA keeps you from mailing to addresses people have already left. This free scan does neither, it is only a structural preview, but it tells you quickly whether your list is in good enough shape to be worth a full cleanup before printing and mailing.
No. This free scan is a preliminary list-structure check. It looks for duplicates, missing fields, malformed ZIP codes, invalid state values, and ZIP and state mismatches using reference data in your browser. It is not official USPS CASS or NCOA processing and it does not validate that an address is deliverable. For production mail, MPA can run certified address cleanup, including CASS standardization and NCOA move updates, before printing and mailing.
No. The free scan runs entirely in your web browser. Your file is parsed and analyzed locally on your own device. It is not uploaded to MPA, and no third-party service sees your data during the free scan. Only if you choose to request official cleanup or a mailing quote can you securely send your file to MPA in a later step, and only after you confirm it does not contain regulated data.
CASS, the Coding Accuracy Support System, standardizes and validates each address against the USPS database. It corrects formatting, adds the full ZIP+4, and confirms the address is a real, mailable delivery point. NCOA, the National Change of Address service, compares your list against USPS move records from roughly the last 48 months and updates addresses for people and businesses that have moved. CASS fixes the address as written. NCOA follows the mover to a new address. Most direct mail benefits from both before printing and mailing.
You pay to print and mail every record on the list, whether or not the piece is deliverable. Duplicate records mean you print and mail the same household two or more times. Undeliverable addresses, missing apartment numbers, and people who have moved produce returned or discarded mail that still cost full postage. The U.S. Postal Service estimates roughly 14 percent of Americans move each year, so an uncleaned list decays quickly. Bulk address verification and deduplication before the mailing remove that waste.
The tool accepts CSV files and Excel files in .xlsx or .xls format. It automatically detects common column names such as name, company, address, city, state, and ZIP, even if the headers are capitalized or labeled differently. It can scan lists up to tens of thousands of records directly in your browser without uploading the file.