With this effective four-step verification, Atomic Mail Verifier allows you to weed out the maximum number of nonexistent addresses, as well as prevent the removal of those that are truly valid. Mostly the rule for such status is that this server accepts all emails sent to it even if the email on the server is non existent and overall we recommend to avoid such emails in your campaigns unless absolutely necessary, because there is not way to validate those For instance, we validated in the log you can see the app generated a random address with the same domain, in this case (so it should not exist), but the server replied that it exists, thus we can not state that exists for sure. If a server responds that a generated email is valid, a defined email you aimed to validate will be marked as "email domain has a catch all function enabled".