The ZeroBounce AI Scoring API combines a vast selection of data with proven statistical analysis to granularity rate the quality level of an email address. The software identifies positive and negative patterns of an email address and returns a score that users can rely on when performing their email hygiene. The methodology of ZeroBounce A.I. periodically adjusts as email trends evolve.

Get an in-depth look into the quality of your leads by learning more about your subscribers’ online activity. With the added information you can segment your lists to better serve your customers with targeted messaging. If you want to further segment your email list based on Quality Score, we recommend validating your "valid" file also.

Recommended File management endpoint for AI Scoring

Recommended File management endpoint usage

AI Scoring API: Send File

Ready to use our bulk email scoring API?

The scoring sendfile API allows you to send a file for bulk email scoring. The content type needs to be multipart/form-data. Please refer to the C# example for details.



Below you will see a list of the required parameters. Please gather this data in the right format before you proceed.

  • Your file needs to have a .csv or .txt format.
  • Next, you’ll need your unique API key which you can find in your ZeroBounce account.

URL Parameters

  • Parameter
    Required / Optional
  • file
    The csv or txt file. Byte array contents for the submitted file. The content's header is type of "text/csv"
  • api_key
    Your API Key, found in your account
  • email_address_column
    The column index of the email address in the file. Index starts at 1
  • return_url
    The URL will be used as a callback when the scoring service is completed
  • has_header_row
    If the first row from the submitted file is a header row. True or False
  • remove_duplicate
    If you want the system to remove duplicate emails (true or false, default is true). Please note that if we remove more than 50% of the lines because of duplicates (parameter is true), system will return a 400 bad request error as a safety net to let you know that more than 50% of the file has been modified.
If a return_url was specified in the Multipart Form Data during the send file request, we will POST the following data to the URL when the validation process is complete.

        "file_id": "aaaaaaaa-zzzz-xxxx-yyyy-5003727fffff",
        "file_name": "Your file name.csv", 
        "upload_date": "2023-04-28T15:25:41Z" 



Here we provide you with examples of both successful and error responses for the bulk email scoring API.

Successful Response

        "success": true,
        "message": "File Accepted",
        "file_name": "Your file name.csv",
        "file_id": "aaaaaaaa-zzzz-xxxx-yyyy-5003727fffff"
Error Response

        "success": false,
        "message": [
            "Error messages"

Do you have any questions or need help getting started with the ZeroBounce bulk email scoring API? Please get in touch with our team. Our Customer Support specialists are available 24/7 to guide you and help clarify potential issues.

The email scoring API can be used both in bulk and in real time.