THE 3 KEY STAGES OF OUR EMAIL VERIFICATION PROCESS
SYNTAX CHECKING
johnsmith47&hotmail.com
We check the overall syntax of the email address to see if it is correct, e.g does it contain an @ sign or any invalid email address characters?
DOMAIN CHECKING
johnsmith47@hotmail.com
We then check the domain to see if it exists, and is it configured to accept email? then we’ll look at the mailbox, the part before the @ symbol.
MAILBOX CHECKING
johnsmith47@hotmail.com
Finally we check the mailbox, the part before the @ symbol, directly with the ISP, in this case Hotmail, to see if the mailbox exists or not.