title: No supported authentification method when sending email
body: <p>I tried to send an email using SMTP server but I couldn't. 
  I am getting this message: </p>
  
  <pre><code>SMTP-AUTH: No mutually supported authentication methods available
  Authentification Failed
  </code></pre>
  
  <p>So I connected to server using telnet.</p>
  
  <pre><code>telnet server 2526
  ehlo server
  250-server Hello [xxx.xxx.xxx.xxx]
  250-SIZE 36700160
  250-PIPELINING
  250-DSN
  250-ENHANCEDSTATUSCODES
  250-AUTH
  250-8BITMIME
  250-BINARYMIME
  250 CHUNKING
  </code></pre>
  
  <p>I think that the server is not configured well, because there isn't STARTTLS option (it's Microsoft Exchange server). I'm a bit confused, because there's AUTH optionm but I don't know what does it mean. Thank you for any help.</p>