EmailVerify.NET - Inspect e-mail verification failures in VB.NET

The following example verifies a single e-mail address up to mailbox existence and, should it find the validation is not successful, it would inspect some of the possible failure types.

        Dim verifier = New EmailVerifier()
        Dim status = verifier.Verify("address@example.org", VerificationLevel.Mailbox)

        If status.IsSuccess Then
            Console.WriteLine("Mailbox verification test succeeded!")
        Else
            ' The test failed. Let's see why...
            
            If status.IsSyntaxFailure Then
                ' The email address is not syntactically valid
                ' TODO: Discard this address immediately
            ElseIf status.IsTimeoutFailure Then
                ' It failed because of a timeout, thus it could be valid. 
                ' TODO: Save a reference to this address for future retries
            ElseIf status.IsNetworkFailure Then
                ' It failed because of a network failure: chances are high that this address is not valid.
                ' TODO: Discard this address or save it for future retries
            End If
        End If
    

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