Why does Email Validator returns every Yahoo Address as correct. Even an Invalid
Email Address like firstname.lastname@example.org?
Some mail servers always return a positive response that a mailbox exists, and it
is only until an email is sent to a mailbox, that the server responds with a negative
response saying a mailbox does not exist. Microsoft's exchange server is notorious
for doing this. However, we have optimized Email Validator control to help with
this situation, and return faster results against those known servers.