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Why would email messages bounce though the API finds that the email address exists?

Email Verification API uses various techniques to check if an email address is a valid one on the server. Depending on the server and configuration, the return result may indicate that the user is valid (e.g., SMTP = true) even though the message may still fail further upstream to prevent SPAM and reconnaissance. In such instances, an email message would bounce though it is technically existing and valid.