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Email Verification Services

Batch & Real-Time Data Enrichment

Achieve Industry-Leading Match Rates with 99.5% Deliverability. Turn your incomplete lists into revenue-generating assets. We match, verify, and append missing consumer email addresses starting at just $0.02 per record.
Start Your Free Match Test
GDPR Compliant | No Setup Fees | Secure Upload
4B

Mobile Advertising IDs (MAIDs)

700M

Verified Phone Records

1B

Opt-in Consumer Emails

Trusted by:

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The image shows the Ford logo, featuring the word Ford in white script inside a dark oval with a white border.
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The Girl Scouts logo features the words girl scouts in bold black lowercase letters next to a solid gray trefoil symbol.
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Our PROVEN TRACK RECORD

opt-in
Opt-in email addresses in our master database.
0 + Billion
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Hashed emails for secure matching.
0 + Billion
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Records updated daily to ensure freshness.
0 + Million
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Email deliverability validity.
0 %

Stop Losing Revenue to Incomplete Data

You have the names and postal addresses, but you are missing the digital connection. Every record in your CRM without an email address is a dead end for your marketing automation, retention campaigns, and revenue growth.
The Solution: The Data Group fills these gaps. Unlike generic tools that rely on outdated public records, we use a proprietary multi-source validation process. Whether you need a one-time batch email append for a legacy database or a real-time API connection for incoming leads, we ensure you get active, valid addresses – significantly reducing the risk of spam traps.
Free trial data test
A table with three columns—Client Name, Phone Number, and Status—displays customer data services: John W.: +13654875; Margo R.: +19865489, validated; Will D.: +25654589, added.

Our 3-Step Process: Beyond Standard Verification

Most providers just “match and dump” data. We don’t. While competitors rely on basic SMTP checks (which often return up to 40% invalid emails), our proprietary engine digs deeper.

Step 1

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Identity Matching

We match your input file against our master database of 1+ Billion consumer records using fuzzy logic to handle misspellings. This ensures we identify the right individual.

Step 2

Black and white icon showing a chart document with a padlock and a dotted curved line connecting them, symbolizing secure or protected data and information privacy.

Proprietary Verification (Beyond SMTP) The Critical Difference.

We go beyond the standard “SMTP handshake” used by most vendors. Our proprietary validation process analyzes multiple data signals to verify the inbox is truly active and safe. This allows us to filter out threats that standard checks miss.

Step 3

product selling

The Append & Delivery

You receive a clean, enriched file ready for use. We guarantee that 99.5% of the appended emails are valid and deliverable addresses.

What Makes Our Data Better?

Our team of experts leverages cutting-edge technology and extensive industry experience to provide comprehensive data solutions tailored to your business needs. We manage over 500 million Mobile Ad IDs and 1 billion privacy-compliant emails, ensuring your data is robust and reliable.

100%

Free data test

Try our data services risk-free with a complimentary data quality test before committing.

24/7

Personalized support

Trust our services to deliver up to 90% match rates, guaranteeing highly accurate customer data.

$0.02

For one record

Affordable data enhancement at just $0.02 per record, maximizing your marketing ROI.

The team at The Data Group always provides us with great data and great customer service.

National Ford Dealer

We have worked with The Data Group for over 15 years and they are our go to for high-quality data.

Marketing Agency

90%

Match rates

Trust our services to deliver up to 90% match rates, guaranteeing highly accurate customer data.

We Are Consumer Data Specialists

Many providers try to do it all – mixing business and consumer data, leading to low accuracy. We focus 100% on Consumer Data. This specialization allows us to maintain the freshest, most accurate database of individual consumers in the industry.

What We Append:

  • Personal Emails: (Gmail, Yahoo, Outlook, etc.)
  • Demographics (Optional add-ons available)
  • Target Audience: Individual Consumers & Households.
Note: We do not provide B2B (Business-to-Business) appending. Our entire infrastructure is optimized for connecting you with people, not corporations.
A table with three columns—Client Name, Phone Number, and Status—displays customer data services: John W.: +13654875; Margo R.: +19865489, validated; Will D.: +25654589, added.

Transparent Email Append Pricing

We believe you should only pay for results. That is why our pricing model is strictly Performance-Based.
  • No Match, No Pay.
  • Unbeatable Rate: Batch email appends start as low as $0.02 per record.
  • Enterprise Volume? Contact us for tiered discounts.
Wondering about the total email append services cost for your project? Upload a sample for a free audit.
Global Reach, Local Standards. While we process data globally, The Data Group is proud to be recognized as the Leading Nationwide Email Append Service. We operate under strict U.S. data privacy laws (CCPA/GDPR ready) and provide dedicated account management – support that offshore providers cannot match.

Ready to Test Our Data for FREE?

Let us earn your business. Upload a sample file of up to 100 records and we will append a custom dataset for you at no cost.
Get My Free Test Key
Smiling woman on mobile phone with shopping bags – Accurate phone append services for consumer outreach
Industries

What Sectors We Serve

Nonprofits

01

We support charities, associations and membership organisations with data enrichment that increases deliverability, reduces waste and heightens engagement.

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Flexible ecosystem
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All-in-one CRM
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Live donor profiles
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Time-saving automation

Learn more

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Retail

02

From bricks-and-mortar chains to digital marketplaces, retail and eCommerce businesses rely on accurate contact, purchase-behaviour and demographic data to engage shoppers, optimise lifetime value, and maximise ROI on campaigns.

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Omnichannel identity linkage
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Real-time shopper insights
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Predictive buyer personas
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ROI-driven segmentation

Learn more

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Healthcare

03

In a regulated and data-sensitive environment, accuracy, compliance and engagement matter. We assist healthcare-providers, medical-device firms and pharmaceutical marketers in cleaning and enhancing patient, provider and HCP data for improved outreach, segmentation and campaign performance.

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Compliance-first architecture
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Verified HCP signals
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Fragmented Patient Data Linkage
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Regulatory-grade accuracy

Learn more

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We support charities, associations and membership organisations with data enrichment that increases deliverability, reduces waste and heightens engagement.

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Flexible ecosystem

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

All-in-one CRM

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Live donor profiles

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Time-saving automation

Learn more

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From bricks-and-mortar chains to digital marketplaces, retail and eCommerce businesses rely on accurate contact, purchase-behaviour and demographic data to engage shoppers, optimise lifetime value, and maximise ROI on campaigns.

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Flexible ecosystem

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

All-in-one CRM

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Live donor profiles

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Time-saving automation

Learn more

A gray arrow pointing diagonally upward to the right on a light, textured background.

In a regulated and data-sensitive environment, accuracy, compliance and engagement matter. We assist healthcare-providers, medical-device firms and pharmaceutical marketers in cleaning and enhancing patient, provider and HCP data for improved outreach, segmentation and campaign performance.

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Flexible ecosystem

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

All-in-one CRM

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Live donor profiles

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Time-saving automation

Learn more

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The Blog

Industry Articles and News

Voter Data Precision – How Accurate Demographic Personalization Changes the ROI of Political Outreach Campaigns
6 Ways Consumer Email Append Drives B2C Growth
Data Enrichment vs Data Append: What’s the Difference and Which Do You Need?
Real-Time vs Batch Processing: A Technical Look at Why API-Driven Data Enrichment is Superior for Modern Sales Teams
Donor Intelligence: How Data Enrichment Helps Non-Profits Identify Major Gift Prospects
Consumer Email Data Decay: How Data Hygiene Practices Protect Your Marketing Budget
Voter Data Precision – How Accurate Demographic Personalization Changes the ROI of Political Outreach Campaigns
6 Ways Consumer Email Append Drives B2C Growth
Data Enrichment vs Data Append: What’s the Difference and Which Do You Need?
The Blog

Industry Articles and News

Voter Data Precision – How Accurate Demographic Personalization Changes the ROI of Political Outreach Campaigns
6 Ways Consumer Email Append Drives B2C Growth
Data Enrichment vs Data Append: What’s the Difference and Which Do You Need?
Real-Time vs Batch Processing: A Technical Look at Why API-Driven Data Enrichment is Superior for Modern Sales Teams
Donor Intelligence: How Data Enrichment Helps Non-Profits Identify Major Gift Prospects
Consumer Email Data Decay: How Data Hygiene Practices Protect Your Marketing Budget
Services

Related Services

how reverse email appending can expand your customer reach and boost results

Reverse Email Append

email validation services

Email Verification

FAQs

Email Append FAQs

Q: How fast is the batch email append process?
A: We are built for speed. For most files, we return fully appended and verified results within a few hours.
A: Email append pricing is primarily driven by volume. Since we are the direct data source, we offer the industry’s most competitive rate of $0.02 per match.
A: To get the highest match rates, we recommend providing First Name, Last Name, and Postal Address (Street, City, State, Zip).
A: Yes. We guarantee that 99.5% of the emails we append are valid and deliverable addresses. Note: Your actual campaign open rates may vary depending on your own sender reputation and email content.
A: Appending without hygiene is dangerous. It risks introducing spam traps into your clean database. Our proprietary process cleans your list before adding new data, ensuring your investment yields high ROI, not blocked IPs.
A: Yes, this is a common use case. However, for data older than 2 years, match rates may be lower as people abandon old accounts or change email providers. We recommend starting with your most active customers.
A: Absolutely. We only source data from permission-based aggregators where users have opted in to receive third-party communications.
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Services

Data Append

Demographic Append

Email Append

Email Validation

Phone Append

Psychographic Append

Reverse Email Append

Reverse Phone Append

Programmatic

Anonymous Digital Retargeting

Audience Data

Enhanced Data Onboarding

Custom Mailing

Mailing Lists

API

Auto Append API

Demographic Append API

Email Append API

Email Validation API

Phone Append API

Reverse Email Append API

Reverse Phone Append API

Pricing

Contact Us

Voter Data Precision – How Accurate Demographic Personalization Changes the ROI of Political Outreach Campaigns
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Logo for The Data Group with THE in white text on a blue vertical background and DataGroup in bold black and gray text on a white background.
Free Trial
Services

Data Append

Email Append

Reverse Email Append

Email Validation

Phone Append

Reverse Phone Append

Demographic Append

Psychographic Append

Programmatic

Audience Data

Anonymous Digital Retargeting

Enhanced Data Onboarding

Custom Mailing

Mailing Lists

API

Pricing

Contact Us

Voter Data Precision – How Accurate Demographic Personalization Changes the ROI of Political Outreach Campaigns
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