title: What version TLS does System.Net.Mail.SmtpClient support?
body: <p>I'm sending emails using System.Net.Mail.SmtpClient. It has an EnableSsl property that seems to work most of the time, but now one user claims that his email provider will only accept connections with minimum TLS 1.2 and that he is trying to connect using TLS 1.1.</p>
  <p>What versions of TLS can System.Net.Mail.SmtpClient use?</p>