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AccuValid leverages server technology and proprietary data to verify an email address and validate its viability for deployment.

Every email address is analyzed independently, undergoing a multi-step process that ultimately determines its potential for deliverability. During the process, AccuValid queries the destination email server without actually sending an email message, and then interprets the response. It also evaluates the address against proprietary data.

Why Validate Your Email List?

If you've ever deployed a direct mail (postal) campaign, you've probably had mail returned to you with the following comments from the U.S. Postal Service: "Address Unknown", "Undeliverable as Addressed", "Address Vacant", and "No Mail Receptacle".

You wouldn't knowingly print and mail a postcard to an address where it's likely to get returned, right? To prevent this from happening, smart marketers run their list through common USPS hygiene processes to eliminate or correct bad addresses.

The same is true for email — but the benefits go much further than saving money on postage:

  • Improve the Quality of Your Email Database

    Don’t let invalid or useless email addresses remain active in your database. Identifying and removing these can improve the quality and accuracy of your data and overall database statistics.

  • Increase Deliverability and the Accuracy of Your Campaign Metrics

    Every bad email address drops your deliverability rate for a campaign. Eliminating them from your deployment will ensure your deliverability rate is much more consistent with your deployment count.

  • Minimize Bounce Rates

    Bounces happen when an email server responds with a message (like the ones listed above from the USPS) about an email you attempted to send to that email domain. When you eliminate these addresses, you’ll significantly reduce bounces and protect your online reputation.

  • Protect Your Online Reputation

    Every major email subscriber service (such as Gmail, AOL, or Hotmail) tracks the emails you send to their domains. Sending an email to an address that doesn't exist or to one that rarely gets checked can have negative consequences.

    • Blocked IP or Domain — The domain or IP address(es) that your email is deployed from could be blocked by the email subscriber service so that none of your emails get through to any of their recipients.

    • Blacklisting — The domain or IP address(es) that your email is deployed from could be added to various lists of offenders. Major email subscriber services collectively use these lists to automatically block incoming emails appearing to be sent by senders on these lists.

  • Increase the Likelihood of Inbox Placement

    Not being blocked or blacklisted is a good first step at getting email through to the inbox. Another positive step is to build credibility with email subscriber services. Eliminating suspicious addresses that might be associated with feedback loops (such as "spam traps") will help ensure you're sending to legitimate addresses. Ultimately, the stronger your credibility, the better your chances are for getting emails through.

Validation Results and Recommended Actions

After an email address has been analyzed, AccuValid appends a result code that will appear on the output file you receive.


The result codes appended to your list provide comprehensive insights into each email address. You can use this information, along with AccuValid’s recommended actions, to make informed decisions about deploying to the respective addresses.

AccuValid Result Codes and Recommended Actions

AccuValid Codes:
Code Descriptions: Recommended Action:
A Email address is invalid; a hard bounce or invalid recipient response was received from the email server Undeliverable
C Email address domain verified, appears to be an accept-all domain Deliverable, good to go!
D Email address domain is invalid and/or does not accept email Undeliverable
F Email address is not valid syntax; there are errors in the format of the email or the email contains special characters that are not allowed Undeliverable
M Mobile domain, identified as a mobile email address and classified as non-deliverable by the FCC Undeliverable
O Email address is identified as being on a global opt-out list Consider removing
R Email address is role-based (such as info@domain.com or sales@domain.com) Consider removing
S Email address is on one of more blacklists or email address is associated with being screamers/litigators Consider removing
T Associated domain identified as a disposable domain Consider removing
U Domain verified; mailbox undetermined Deliverable, good to go!
V Email address is valid as we can determine with the ISP (Internet Service Provider) Deliverable, good to go!
W Email address has been identified as a spam report/complainer Consider removing
X Email address has been identified as a SPAM trap Consider removing
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