Knowledge Base > How It Works

What do the codes in my report mean?

Get started with DataValidation's email list cleaner by linking an email service provider account or uploading an email list (via .csv or .txt). You will receive a Free Quality Report for each email list imported through an email service provider or uploaded manually to our system.

1. Free Quality Report

We verify your email database or list and provide a report card with a preview analysis of the emails from your list. You will see the Quality Score of your list and what percent of your email is safe and unsafe. 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 Verification Grades

  • A+ (Deliverable + Engagement Activity)
    A+ graded email addresses are verified as deliverable. They also have engagement history concerning email clicks and opens. These email addresses are always safe to send your campaigns to.

  • A (Deliverable)
    A graded email addresses are verified as deliverable. A deliverable result means the recipient's mail server confirms that the recipient exists. These addresses are also Safe.

  • B (Accepts-all / Catch-all)
    These email addresses belongs to Catch-All servers. A Catch-All email server is set to accept any email--even if the email address doesn't exist. Later, if the email address doesn't exist, the Catch-All server will bounce the email. This 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.

  • D (Indeterminate)
    If we are unable to fully connect to the mail server, we assign a "D" grade to the email address. We make several attempts to connect to these servers. However, we can't always fully connect to all mail servers. This can happen if the mail server is temporarily down, or if the mailbox is full etc. We do not recommend sending to the Indeterminate category. All emails with a grade of D should be segmented off your list.

  • F (Undeliverable)
    F graded email addresses are deemed undeliverable and are, therefore, invalid. These emails are unsafe to send to! These addresses should always be unsubscribed from your email database.
    Your Free Quality Report enables you 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. Because we verify email databases and assign a grade to each contact, 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 the email list cleaner Address-by-Address analysis you will also have extra information 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. We highly recommend that 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 verifying, 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 [email protected] is the same as [email protected] 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
    [email protected] United Kingdom
    [email protected] Germany
  • EU (European Union) domains
    Your report also 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
    [email protected] EU
    [email protected] EU
    [email protected] ?
    [email protected] 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
    [email protected] FREE
    [email protected] FREE
    [email protected] 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
    [email protected] NOT-HUBSPOT-FREE
    [email protected] HUBSPOT-FREE
    [email protected] HUBSPOT-FREE

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