How does LeadIQ verify email addresses?


The LeadIQ extension does it's own qualification tests for work emails that it finds.

The way we LeadIQ extension verifies emails is as follows:

  • We contact their mail server and ask, for example, "Does exist?" and their mail server should say yes since that is valid.  
  • Then we ask "Does exist?"  and they should say No because it's not valid.  If it says No, we know it only accepted the legit email and we consider it verified.
  • If they say yes to all formats, we can not verify the email because it's using a Catch-All system and accepting all mail and then rejecting it on the backend.  This is an Unverified status.
  • If we have a verified email from someone at a company, and other emails are unverified, we assume the company uses the same format for everyone, which isn't always the case (for example, we have 3 Ryans working for us, so they have various versions of emails).  We list those as "Best Guess"

We also do use other methods, including third-party vendors, as data sources beyond our own testing.


If you have any trouble, please contact our Support team by clicking "Submit a request" at the top right of this page for further assistance.


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