These unknown results in most cases result from Greylisting which is technology that reduces spam by rejecting initial email delivery attempts. The email addresses which could not be verified due to one reason or the other are marked by the program as "Unknown". The level of accuracy you can obtain depends on the inbound SMTP connection policy of the remote ISP or ESP, reputation of the incoming connecting IPs and many other factors. Is it possible to verify ALL emails with the Advanced Email Verifier?Īlthough the Advanced Email Verifier has a very good email validation success rate with most free email ISPs or ESP, it is simply not possible to guarantee a 100% accuracy level due to certain multiple factors beyond our control. Those who run a mailing list over the Internet will find Advanced E-mail Verifier (AEV) to be a very helpful tool to verify and validate email addresses. The primary reason why people purchase Advanced Email Verifier is because it is way ahead of its competitors, has awesome features and, thanks to the ability to process large email lists and handle bounced emails, it guarantees almost 100% accuracy in detecting bad email addresses.
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