Your Best Customers Are Already In Your Database — You Just Can't Reach Them
Missing, outdated, and fake email addresses limit campaign reach, reduce engagement, and leave revenue on the table. Our email append service matches and appends verified email addresses to your existing customer records and 1st party data so you can stay connected with existing customers throughout their lifecycle, strengthen your customer database, and improve marketing ROI without buying new leads.
Opt-in Consumer Emails
Hashed Emails
Consumers
Trusted by:
What Is Email Append?
Email append is a data enhancement service that adds verified, permission-based, and accurate email addresses to your existing customer records. You provide names and mailing addresses, and we’ll enrich your records with verified consumer email addresses.
The result: a larger, more reachable audience built entirely from customers you already know — without buying new leads.
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
$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.
The Email Append Advantage
Up to 90%
Match Accuracy
Our advanced matching process identifies and appends verified and deliverable email addresses with up to 90% accuracy, giving you confidence in the quality of the data added to your customer records.
$0.02
Cost Per Match
Why pay for records that don’t match? With pricing starting at just $0.02 per successful match, you only pay for the data that grows your marketing reach.
Same Day
Turnaround Time
We know timing is important. Most of our email append projects are completed on the same day, often within just a couple hours from submission.
Enterprise Grade
Data Security
We use secure file transfer protocols and strict data handling procedures at every stage of the process. Your customer data is never resold, shared, or retained after delivery.
100 %
Free Match Test
See the results before making a commitment. We’ll run a complimentary match test on a sample of your records so you can evaluate match rates and data quality firsthand.
24/7
Customer Support
We’re here 24/7. Our data specialists are available round the clock to answer your questions, provide project updates, and guide you through every step. Get in touch via chat, phone, or email.
Turn Incomplete Records Into Reachable Customers
Every customer you can’t reach is a potential sale, renewal, donation, or repeat purchase that’s slipping away.
Your database already contains valuable customer information. But, customer data naturally becomes less accurate over time. People change jobs, switch email providers, create new email accounts, and stop using old ones. Over time, those changes can leave gaps in your database and reduce the number of customers you can reach.
The TDG Difference: We append verified email addresses that help you recover valuable customer connections. With verified data, transparent pricing, and fast turnaround times, we get you more value from the customer data you already own. Our tailored approach to email address data and cost-effective solutions make us a preferred choice for businesses and organizations of all sizes.
Our Four-Step Email Append Process
Adding missing addresses to your email marketing database doesn’t have to be complicated. Our proven four-step process turns your incomplete customer records into valuable marketing opportunities quickly and securely.
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Step 1: Customer File Review and Preparation
Every project begins with a review of your customer data. We identify records that contain sufficient information for matching, such as names, postal addresses, and other available identifiers.
Our team also evaluates file quality, removes formatting issues when necessary, and ensures your data is ready for accurate matching. -
Step 2: Advanced Email Address Matching
We compare customer records against billions of customer and business identity signals to identify the strongest available email match. Each match is scored based on accuracy, confidence, and deliverability before moving to validation. -
Step 3: Email Validation and Quality Checks
Potential matches undergo multiple validation and quality-control checks before being appended to your file. We assess deliverability, match confidence, and data quality to ensure that appended email addresses meet our standards for accuracy and reliability. -
Step 4: Enhanced File Delivery
Once processing is complete, we deliver an enriched customer file containing newly appended email addresses. Your team can immediately use the enhanced data for email marketing, customer retention, CRM enrichment, and audience development initiatives.
What Our Email Append Service Can Do for Your Business
- Maximize the value of your existing customer database
- Reactivate lapsed customers with targeted email campaigns
- Improve campaign performance with a larger matched base and lower bounce rates
- Fill CRM gaps and improve data quality across records
- Enable richer segmentation and lifecycle personalization
- Reduce reliance on costly list-building and acquisition efforts
- Increase marketing ROI by reducing spend on undeliverable emails.
THE DATA BEHIND OUR EMAIL APPEND RESULTS
For more than 20 years, we’ve helped organizations improve customer data quality, expand audience reach, and support better marketing outcomes through data enrichment services.
From growing businesses to enterprise organizations, we’ve helped companies across multiple industries improve the quality and reach of their customer databases.
Match existing data against a large database of permission-based email addresses to identify missing contact information.
Leverage hashed email data for secure, privacy-conscious matching that supports accurate email append and identity resolution.
High-quality matching and validation processes help support strong deliverability and greater confidence in appended email addresses.
Our databases are continuously updated to improve data accuracy, maintain freshness, and support better consumer email append results.
Our team has helped businesses enrich and enhance millions of customer files, giving marketers more complete and actionable customer data.
Email Append vs. Email Verification
These two services solve different problems. Understanding which one you need saves time and money.
| Service | What you start with | What you get | Best for |
|---|---|---|---|
| Email append | Name + postal address | Matched email address | Records missing email |
| Email verification | Existing email address | Valid/invalid/deliverable status | Records that have emails but need quality checks |
What Industries We Serve
Retail & Ecommerce
01
Reach more customers through email by enriching existing records with verified contact information. Increase engagement, reactivate past purchasers, and drive stronger customer retention.
Lead Generation & Agencies
02
Help clients get more value from existing customer and prospect data by appending missing or outdated email addresses that support lead nurturing, remarketing, and customer engagement campaigns.
Nonprofits & Fundraising
03
Expand your donation request outreach by connecting with more supporters through email. Strengthen fundraising campaigns, improve retention efforts, and increase engagement across your donor community.
Financial Services, Home Services & Local Brands
04
Connect with your audience by appending missing email addresses to customer database, making it easier to support retention campaigns, appointment reminders, service updates, and promotional outreach.
We support charities, associations and membership organisations with data enrichment that increases deliverability, reduces waste and heightens engagement.
Flexible ecosystem
All-in-one CRM
Live donor profiles
Time-saving automation
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.
Flexible ecosystem
All-in-one CRM
Live donor profiles
Time-saving automation
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.
Flexible ecosystem
All-in-one CRM
Live donor profiles
Time-saving automation
Combine Email Append With Data Enrichment Services
Email is only one piece of the customer profile. Combining email append, email verification, data enrichment, and data append services creates a more complete view of every customer.
With a single project, your team recovers missing email addresses, validates existing contacts, appends additional customer information, and creates more complete customer profiles. The result is a cleaner database, improved audience reach, stronger segmentation, and more personalized marketing campaigns.
By combining these services, you have a complete view of your customers and more opportunities to connect with them across email, phone, direct mail, CRM, and digital channels.
Simple, results-based pricing
$0.02 Cost Per Match
No setup fees. No charge for records we can’t match. Volume discounts available for large or recurring projects.
- Only pay for records where a verified email is found
- Free match reports on a sample file before you pay
- Volume discounts for large files and recurring projects
- Batch processing and custom workflows supported
- Same-day turnaround on most projects
Industry Articles and News
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Email Append FAQs
Q: What is email append?
A: Email append is the process of adding missing email addresses to existing customer or prospect records using trusted data sources.
Q: How does email appending work?
A: A service provider matches the information in your database, such as names and postal addresses, against verified data sources to identify and append email addresses.
Q: What data is needed for email append?
A: We only require the customer’s first name, last name, address, city, state, and zip code.
Q: What match rate can I expect?
A: Our matching process delivers up to 90% hit rate, and every potential match undergoes validation and quality checks.
Q: How does your pricing work? Are there any hidden fees?
A: Pricing starts at $0.02 per successful match. You only pay for records where we find and deliver a verified email address. There’s no setup cost.
Q: What happens to records that don't get matched?
A: Unmatched records are returned to you as-is. You won’t be charged for them, and they won’t be altered. You can resubmit unmatched records after a period of time, as our database is updated with 250+ million records daily.
Q: Will email append improve email marketing ROI?
A: Yes. Email append improves your email marketing ROI. Studies show up to a 30% increase in ROI when email appending is done correctly.
Q: What makes The Data Group email appending service unique?
The Data Group combines extensive customer and business databases, advanced matching technology, and rigorous data quality standards to deliver accurate email appends, strong match rates, fast turnaround times, and privacy-compliant results.
Q: Can you append emails for old customers?
Yes. Many companies use email append to reach inactive or historical customers whose contact information is incomplete or outdated.
Find Out How Many Email Addresses You're Missing
