Best Marketing List Validation Services

Data Hygiene Services for
Address, Email & Phone Lists

Clean, standardize, and verify your marketing lists — address standardization, email verification, phone scrubbing, and data cleansing, all in one platform.

Mailing Address Hygiene

Standardize and validate large mailing lists with 48-month NCOA move updates, ZIP correction, ZIP+4 append, and street name fixes. Starts at $5 per 1,000 — 50,000 record minimum.

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Email Verification

Clean your email list before you send — verify addresses, remove invalid and risky emails, and reduce the bounces that hurt your inbox placement. $0.005 or less per email

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Phone Scrub

Clean your call list before you dial — identify cell vs. landline, flag Do-Not-Dial numbers, and reduce invalid and risky phone records.
$0.005 or less per phone

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Fast file processing
Bulk list hygiene
API options available
Pay only for the services you need

Bulk Volume Pricing

The Bigger Your List, the Lower Your Price.

List VolumePrice per RecordCPM
Up to 250,000 Records$0.005$5 per 1,000
250,000 – 500,000 Records$0.004$4 per 1,000
500,000 – 1 Million Records$0.003$3 per 1,000

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Phone Hygiene

Scrub Your Phone Data Before You Dial

Improve call-list quality by identifying phone type and flagging numbers that may be invalid, risky, or undesirable for marketing outreach.

Know What's in Your List

Datazapp's Phone Scrub service runs your phone records against a master suppression database and adds useful hygiene indicators directly to your file. Keep your original records intact while gaining the information needed to decide which numbers you want to call, suppress, or review.

Identify Wireless, Landline, VOIP, Toll-Free and other phone types
Flag recommended Do-Not-Dial numbers
Identify invalid and potentially risky phone records
Flag business and government phone lines
Screen for deceased, elderly and other suppression categories
Preserve your original file and append hygiene flags
$0.005 or less per phone record
400M+ suppression records
< 5 Min. typical turnaround
customer_phone_list.csv
Phone hygiene results
Scrubbed
Hygiene Fields Added
Phone Type
W — WIRELESS
Do-Not-Dial Status
Y — FLAGGED
Risk Indicator
X — RISKY
Invalid Number
I — INVALID
Phone Scrub is intended as a data hygiene and risk-mitigation service and does not guarantee DNC, TCPA, or other regulatory compliance.

Email Verification

Ensure Deliverability & Protect Your Sender Reputation

Verify email addresses, remove bad emails, and improve deliverability for as little as $0.005 or less per email.

Bad emails cost more than wasted sends — they can damage your domain reputation, increase bounce rates, and hurt inbox placement. DataZapp’s Email Verification service helps identify invalid, risky, disposable, catch-all, and harmful addresses before your campaign goes out.

Syntax Checks
SMTP Verification
Spam Trap Detection
Catch-All Flagging
API Available
Postal Hygiene

Clean, Standardize & Update Mailing Addresses

Improve postal deliverability with USPS CASS address standardization and NCOALink® processing that helps identify your contacts who have moved.

mailing_list.csv
CASS + NCOA results
Processed
Original Address
221 main street apt 4
ormond beach fl 32174
Standardized Address
221 MAIN ST APT 4
ORMOND BEACH, FL 32174-XXXX
Postal Hygiene Results
CASS Standardization
VALID
USPS Deliverability
VERIFIED
NCOA Move Check
UPDATED
+ ZIP+4 Enhancement
APPENDED

Make Every Mailing Address Work Harder

Old, incomplete, improperly formatted, and undeliverable addresses can increase mailing costs and reduce campaign performance. Datazapp's postal hygiene services clean and standardize your records using USPS CASS processing, then compare eligible records against NCOALink® data to help identify address changes.

Standardize address formatting using USPS CASS processing
Validate and improve mailing-address deliverability
Check for moves using a 48-month NCOA lookback
Correct and enhance city, state, ZIP and ZIP+4
Reduce wasted mail sent to outdated or unusable addresses
Address Validation
$0.005 or less per address
USPS CASS address standardization plus NCOALink® processing with a 48-month change-of-address lookback.
List Formatting & Data Cleansing

Multiple Large Files, Inconsistent Formats? We Can Help!

Datazapp can restructure, split, merge, deduplicate, and reformat your existing files so your data is easier to upload, match, and use. Contact us for a custom quote.

Mailing Address Cleansing

Clean broken, incomplete, improperly structured, or partially missing address values to make postal data cleaner and more usable.

Example: Fix fragmented or incomplete street, city, state, and ZIP information.

Jumbled Data Recovery

Restore proper record order when rows, values, or related fields have become misaligned or shifted within a file.

Recover the intended relationship between names, addresses, phone numbers, and other record values.

Name Parser

Split full-name values into structured first-name and last-name columns for easier matching, personalization, and database loading.

"Jordan Michaels" → First Name: Jordan | Last Name: Michaels

Address Parser

Break full-address strings into standardized address, city, state, and ZIP columns for cleaner file structure.

"515 N Jones Dr, Dallas, TX, 75217" → Address | City | State | ZIP

Duplicate Finder

Identify duplicate records and coalesce overlapping information into a cleaner, more unique audience.

Reduce repeated contacts while preserving the most complete information available for each record.

Column Joiner

Concatenate values from multiple columns into a single clean field using the spacing and formatting your destination system requires.

"123" | "Main" | "Street" | "West" → "123 Main Street West"

File Linkage

Reconcile columns, records, and tables across multiple files using shared IDs or other common identifiers. File Linkage can help combine data from separate systems into a more complete, connected dataset.

CRM File + Order File + Customer ID Unified File

Have a File That Needs some Help?

Send us the file and describe the format you need. Datazapp can help restructure unusual datasets, repair formatting issues, combine fields, reconcile records, and prepare data for your CRM, marketing platform, database, or downstream workflow.

Clean Up My File