Coveryourasp validating email addresses
So with all of that taken into account, I ran the 117 million email addresses through the model.
CFWS is legal to insert in the written representation of the email address in RFC 5322 and RFC 5321, but it is not a structural part of the email address (you get the email address by deleting all such instances).* Everything to the right of the @ is either a domain name, an IPv4 address literal embedded in , or an IPv6 address literal prefixed with IPv6: and embedded in  (e.g., [IPv6:::1]).* Enclosing a localpart in quotes does not change the email address.