Knowledge Base > How It Works

What do the codes in my report mean?

Get started with DataValidation by linking an ESP account or uploading an email list (via .csv or .txt). For every email list (imported through ESP or uploaded to our system) you will receive a Free Quality Report.

1. Free Quality Report

This report card provides you analysis preview of the emails from your list. You will be able to see the Quality Score of your list and what percent of your email list got a specific grade. This will help you make an informed purchase decision - we believe it should always be free to know the status of your email list, at any time. Your Free Quality Report will provide you with the following information.

2. Email Validation Grades

  • A+ (Deliverable + Engagement Activity)
    The emails given a grade of A+ have been determined to be deliverable. They also have engagement history concerning email clicks and opens. Is always safe to send email campaigns to these email addresses!

  • A (Deliverable)
    The emails that received an A grade have been determined to be deliverable. A deliverable result means the recipient's mail server stated the recipient exists. These addresses are also Safe.

  • B (Accepts-all)
    These emails have been deemed as Accepts-All. A server that accepts all email means that the hostname has been set to accept any mail. This is commonly seen in business email addresses and in many cases, the server will accept all mail and then bounce it back to sender, which in turn hurts the sender's IP Reputation. Sending to an Accept All domain may increase your bounce rates and/or lower your open rates and we do not recommend sending to this category. All emails with a grade of B should be segmented (until later confirmed valid).

  • D (Indeterminate)
    In checking for an email, we were not able to do anything. The email address seems to have a mail server that is running and accepting connections, but we are unable to connect. We do not recommend sending to the Indeterminate category. All emails with a grade of D should be segmented off your list.

  • F (Undeliverable)
    The emails given a grade of F have been deemed as undeliverable and are therefore, invalid. These emails are unsafe to send to! These addresses should always be unsubscribed from your email database.
    After reviewing your Free Quality Report you'll be able to make an informed purchase decision. Upon purchase, you will have access to your list's Address-by-Address Analysis.

3. Appended Address-by-Address Codes

Your Free Quality Report has already provided you with the number of emails that have each grade. Now, with your Address-by-Address Analysis, you can dive deep into your email list to see exactly which emails have which grade, and segment your list based on the grades or codes below.
In your Address-by-Address Analysis you will also have extra info about email addresses:

  • Disposable / Not disposable (DI/NOT-DI)
    Email addresses that point to domains like and are utilizing a disposable email service. These services enable users to create one-time email addresses in order to receive initial communications from a service (such as an activation email) and then are discarded. It is highly recommended you do not mail to disposable email addresses.

  • Role based / Not role based (RB/NOT-RB)
    A role email is an address that's typically associated with a function (postmaster, support, sales, etc.) instead of a person. In some instances, mailing to a role address can lead to a decreased open rate and is generally advised against while sending marketing email.

  • Normalized (canonical) email
    There are some email providers that accept several variants of the same email address. That’s the reason why, before validating, we transform it into a canonical version. The idea is that email providers accept several variants of the same email address. The domain of the email is insensitive, which means that is the same as The canonical version of email addresses is also used when generating the unique results file.

  • Domain country
    The report provides a Domain country label for domains that we have identified to have a certain country origin. The country label will help you segment your contacts by country or region.
    Here are some examples of emails that have the Domain country code:

    Email address Domain country United Kingdom Germany
  • EU (European Union) domains
    The report identifies if the email domain is registered in the EU (European Union) based on the Domain country. Each email is given a Domain is from EU label: EU, NOT-EU, or ? (unknown.) This label will help you segment contacts based on EU afinity and help with EU GDPR (General Data Protection Regulation) compliance.
    Here are some examples of emails with the Domain is from EU code:

    Email address Domain is from EU EU EU ? NOT-EU
  • Free email detection
    Our email analysis detects if an email address comes from a free email service provider. The free email label helps you segment your contacts into B2B (Business to Business) and B2C (Business to Consumer) categories.
    Here are some examples of the Is free email code:

    Email address Is free email FREE FREE NOT-FREE
  • HubSpot free email detection
    The DataValidation email checker sources data from the HubSpot free email providers list. This label allows you to further segment your contacts by filtering out possibly undesireable email addresses.
    Here are some examples of emails with the Is Hubspot free email label:

    Email address Is Hubspot free email NOT-HUBSPOT-FREE NOT-HUBSPOT-FREE HUBSPOT-FREE

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