Certified Email

Certified email is an email whitelisting technique by which an internet service provider allows someone to bypass spam filters when sending email messages to its subscribers, in return for paying a fee to the certifying service. A sender can then be sure that his messages have reached their recipients without being blocked, or having links or images stripped out of them, by spam filters. The purpose of certified email is to allow companies to reliably reach their customers by email, while giving recipients certainty that a certified message is legitimate and is not a forged phishing attempt.

Certified email is also used to describe email whose sending is certified by a neutral third-party, analogous to certified mail.