EmailVerify.NET - Inspect e-mail verification failures in C#

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.

        var verifier = new EmailVerifier();
        var status = verifier.Verify("address@example.org", VerificationLevel.Mailbox);

        if (status.IsSuccess)
        {
            Console.WriteLine("Mailbox verification test succeeded!");
        }
        else
        {
            // The test failed. Let's see why...

            if (status.IsSyntaxFailure)
            {
                // The email address is not syntactically valid
                // TODO: Discard this address immediately
            }
            else if (status.IsTimeoutFailure)
            {
                // It failed because of a timeout, thus it could be valid. 
                // TODO: Save a reference to this address for future retries
            }
            else if (status.IsNetworkFailure)
            {
                // 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
            }
        }
    

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