A Confidence Factor is our proprietary score which rates the chances of successfully delivering email securely (e.g. This proprietary score rates what we feel are the chances that an email sent to the tested address right now would go securely. It takes into account the order and strength of each Mail e Xchanger (MX) listed for the recipient's domain, and the strength, precision, and validity of the recipient's SSL certificates.This matrix lists, for each MX, the MX preference and the steps Test Receiver took in proofing the server.It was designed to test if email can be received securely, but because it continues testing even if TLS fails, it can also show the inner workings of non-TLS email servers. Does not tease out any information like the above Detail levels, nor does it show the Matrix or the Confidence Factor.When using Test Receiver "off-label", for example to verify email addresses or open up the inner workings of SMTP email conversations, the for this address. Note: this output is only useful for the most hard-core debugging, which should be using a packet analyzer instead.This code can be on the server and called on AJAX when user tabs out of the email field.