In some cases we won't return an email because it belongs to a domain that has been blacklisted. 

Reasons for blacklisting:

  1. It's a consumer email address like gmail or hotmail.

  2. We believe the domain and email is likely to belong to a private individual or is likely to cause problems during a bulk process e.g. people listing their domain as instagram.com.

  3. The domain has requested to be blacklisted.

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