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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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    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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    Instead of developing a tool for email verification, you can use service of such providers.
    What you can do is use bulk email verification service provider to clean your email list . Once you have a clean email list, you can use it. Also, you can integrate real-time email verification API with the website so only the verified email address will be added to your list.

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