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    Registered User
    Devshed Newbie (0 - 499 posts)

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    Nov 2017
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    Bulk email verification tool

    One of my clients wants me to develop a tool for bulk email verification. He does have a list of millions of emails.
    How should I start with? I do not have any experience in developing such tool. Appreciate any help!
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  3. Maddening Moderator
    Devshed Supreme Being (6500+ posts)

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    Mar 2007
    Washington, USA
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    The most you can do automatically is verify that there is an email server for the domain:

    1. Look up MX records for the email's domain
    2. If there aren't any, look up A records for the email's domain
    3. Try to connect to the email server at that location
    4. If it connects then good, if it does not connect then bad
    5. Cache the result

    You cannot really determine if the email address itself exists - some mail servers will let you but most will not.

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