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Which email address validations does EmailVerify.NET perform?

EmailVerify.NET can verify email addresses with up to six levels of validation; higher levels mean an higher chance for the addresses to be valid but also generally mean a longer verification time.

It employs these validation techniques:

Syntax validation, according to RFC 2821 and RFC 2822. This one is the fastest validation, because the component does not access the network to contact external servers.
DNS MX record lookup of the email address domain, verifying it does exist.
Disposable Email Address (DEA) check, to ensure the address is not a temporary one.
SMTP availability of the mail server the DNS MX record points to, in order to check whether the aforementioned record is fake or not.
Mailbox existence check, emulating an email client which tries to send an email to the given address, while NOT actually sending any email: EmailVerify.NET is smart enough to do it transparently!
Catch-all test, making sure the mail server we have connected to in the previous level of verification does reject inexistent email addresses; this one helps solving hard bounces detection problem. For maximum safety and accuracy.

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Which email address validations does EmailVerify.NET perform?

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