Append Email Address to your Customer DataB2B & B2C Email Append

You've built a great list of your customers postal information, now it's time to find their email addresses and market to them.

CAS specializes in providing you the most accurate email append and verification services.

What is "Email Appending"?

An email append is simply a process of adding (appending) an email address to a list of names and addresses. This list could be your customers or prospects and comprised of businesses or residential addresses.

Your data is matched against a number of nationwide postal and email files. Hundreds of millions of records go into the match process. When we find a match, we’ll add the email to your file. We can append both business and residential files. We have it all.

What are the benefits to email appending?

It is direct, instant, and quantifiable. It allows you to market to your customers or prospects different ways. With appending CAS helps you enhance your data intelligence, meaning we not only provide you with an email address, we can also provide you with knowledge to further target and implement a successful e-marketing campaign. Below are the benefits you receive when using CAS’ Email Appending services:

  • Increase your sales conversions
  • Generate repeat sales
  • Up-sell and cross-sell products and services
  • Gain feedback from your visitors
  • Brand recognition for off line purchases
  • Saves time and Money

email append workflow process

1.) Getting Started

To start the process, we'll need a list of customer names. We have different levels of matching depending on your data. If it's a residential list, we'll at least need their postal address and preferably name. For business email matching, company name and address is preferred. We can work with most data formats. If you have questions on formatting, call us and we can walk you through the process. We know your privacy is important, so be assured that your information will always be protected within our secure "in-house" data center.

2.) Clean & Standardize

In order to provide the best match rate possible CAS will take your customer database and perform the hygiene and standardize process. We will remove duplicate records and run your data through some standard postal address hygiene processes including the USPS CASS Certification. This allows for higher match rate and deliverability on the append process.

3.) Match & Append

Top notch data quality and multi-sourcing, our append and verify process sets us apart from our competitors. Providing both positive and negative identifications to our match logic we are able to identify the right individual with the right email address at either the individual or household level.

For our business email appends we use a variety of algorithms and domain matches to assure the highest quality of match.

4.) Permission Pass Opt- In & Confirmation

Once we have matched records, the email addresses are sent an opt-in permission message performed by CAS on your behalf to confirm deliverability and availability to market.

5.) Results from Permission Pass

All undeliverable hard-bounce and soft-bounce emails are omitted and opt-out responders are flagged.

6.) Final Standardize & Quality Check

The final file will be returned to you with the deliverable email addresses attached. We will also provide you with the suppression file of "opt-out" records for you to use in your future marketing programs.

7.) Delivery of Fresh New Marketing Emails

CAS will return your original file with your new customer's email addresses appended at the end of each record. Still want to know more about your customers? Click here to read about our demographic append and profiling services.

Email Append Frequently Asked Questions

What types of files can be appended?

Most files can have email address appended to it. All we would need is name and address information. CAS can append emails to any customer file, business or consumer.

How does email appending work?

You give us your full customer database with as many variables as possible (such as contact name, address, phone, etc). We will then run multiple email passes to enhance your existing database. Something important to keep in mind is the more variables you have on your customer database, the more likely it is that you will see a higher match rate.

We also have a Permission Pass service available. With this service we will send an email message that is branded with your company information. The goal of this email message is to give any customers an opportunity to opt-out or update their information on your database. This option is another way to further enhance the data.

Match Rates

Business: With business email append, you can expect a match rate between 35% - 65% compared to the industry average of only 15%-25%. We can match on many variables including: business name, address, URL (which is a unique service to CAS), contact name, and phone

Consumer: For consumer (residential) data, you can expect a match rate between 15% - 35%. We can match on variables such as: name, phone number, address, etc.

Why use CAS compared to the other guys?

  • Highest Industry Match Rates
  • All email address are100% Opt-In
  • We are the source
  • Great results
  • Experienced sales representatives

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Customer Support



You can always send us an email or call us directly at 866-461-4693.

Data Experts are here to help.

CAS Inc
10303 Crown Point Ave
Omaha, NE 68134
866-461-4693

Looking for the List Industry's Best Practices? Call one of our data experts and find out why CAS sets the standard for quality data from a company you can trust. Call 866-461-4693 CLICK HERE to request a Free Quote