Hexillion
 

Interpreting HexValidEmail results

HexValidEmail is a multi-level, server-side, bad-address filter. When an email address passes this filter, however, it isn't necessarily a good address. The following table summarizes what the confidence rating does and does not tell you.

   Confidence rating 
(highest successful validation level)
0
Bad
1
Syntx
2
DNS
3
SMTP
A*
Cbak
B*
Auth
Address is definitely bad for the reason specified by the Error property Y               
Syntax is OK    Y Y Y Y Y
Domain exists       Y Y Y Y
Domain has a working mail server          Y Y Y
Mail server did not reject address          Y Y Y
Local part (username) is valid on destination system             Y Y
Address reaches the recipient you intend and thus is definitely good                Y

*A and B
Not supplied by HexValidEmail. These are optional tests that require actually sending email and are something you would need to custom-develop for your own system.

"Cbak" = "Callback", by which we mean sending an email that contains an URL or reply address that the recipient can use to indicate they received it.

"Auth" = Callback with authentication, which means a sending a callback email that requires the recipient to enter their password, thus verifying they are the intended recipient.
This is the only way to determine an email address is definitely good.

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