title: SASL LOGIN authentication failed: Invalid authentication mechanism
body: <p>I always get this error. I got default dovecot and postfix installed. Sending mail from Thunderbird and PHP pear mail works fine but if I the mail server in vbulletin 4 it gives me this error in the mail.log. </p>
  
  <p>Part from my config file.</p>
  
  <pre><code>smtpd_sasl_auth_enable = yes
  smtpd_sasl_type = dovecot
  smtpd_sasl_security_options = noanonymous
  smtpd_sasl_path = private/dovecot-auth
  smtpd_sasl_authenticated_header = yes
  smtpd_sasl_local_domain = $myhostname
  broken_sasl_auth_clients = yes
  </code></pre>
  
  <p>It also throws this error:</p>
  
  <pre><code> Client host rejected: Access denied;
  </code></pre>