Лучшая практика, должен отправить и HTML и текстовую электронную почту?

Если я только отправляю HTML, каковы опасности?

Я думаю что-то вроде этого ниже от

http://johnnycoder.com/blog/2009/04/15/net-mailmessage-linkedresources-alternateviews-and-exceptions/

try
{
    // Assign a sender, recipient and subject to new mail message
    MailAddress sender =
        new MailAddress("sender@johnnycoder.com", "Sender");

    MailAddress recipient =
        new MailAddress("recipient@johnnycoder.com", "Recipient");

    MailMessage m = new MailMessage(sender, recipient);
    m.Subject = "Test Message";

    // Define the plain text alternate view and add to message
    string plainTextBody =
        "You must use an email client that supports HTML messages";

    AlternateView plainTextView =
        AlternateView.CreateAlternateViewFromString(
            plainTextBody, null, MediaTypeNames.Text.Plain);

    m.AlternateViews.Add(plainTextView);

    // Define the html alternate view with embedded image and
    // add to message. To reference images attached as linked
    // resources from your HTML message body, use "cid:contentID"
    // in the  tag...
    string htmlBody =
        "
Picture

" +
        "";

    AlternateView htmlView =
        AlternateView.CreateAlternateViewFromString(
            htmlBody, null, MediaTypeNames.Text.Html);

    // ...and then define the actual LinkedResource matching the
    // ContentID property as found in the image tag. In this case,
    // the HTML message includes the tag
    //  and the following
    // LinkedResource.ContentId is set to "SampleImage"
    LinkedResource sampleImage =
        new LinkedResource("sample.jpg",
            MediaTypeNames.Image.Jpeg);
    sampleImage.ContentId = "SampleImage";

    htmlView.LinkedResources.Add(sampleImage);

    m.AlternateViews.Add(htmlView);

    // Finally, configure smtp or alternatively use the
    // system.net mailSettings
    SmtpClient smtp = new SmtpClient
          {
              Host = "smtp.example.com",
              UseDefaultCredentials = false,
              Credentials =
                  new NetworkCredential("username", "password")
          };

    //
    //    
    //        
    //            
    //        
    //    
    //

    smtp.Send(m);
}
catch (ArgumentException)
{
    throw new
        ArgumentException("Undefined sender and/or recipient.");
}
catch (FormatException)
{
    throw new
        FormatException("Invalid sender and/or recipient.");
}
catch (InvalidOperationException)
{
    throw new
        InvalidOperationException("Undefined SMTP server.");
}
catch (SmtpFailedRecipientException)
{
    throw new SmtpFailedRecipientException(
        "The mail server says that there is no mailbox for recipient");
}
catch (SmtpException ex)
{
    // Invalid hostnames result in a WebException InnerException that
    // provides a more descriptive error, so get the base exception
    Exception inner = ex.GetBaseException();
    throw new SmtpException("Could not send message: " + inner.Message);
}