title: Net::SMTPAuthenticationError (504 5.3.3 AUTH mechanism PLAIN not available
body: <p>I am trying to send emails from my website by using aplus.net
  I am getting this error
  Net::SMTPAuthenticationError (504 5.3.3 AUTH mechanism PLAIN not available</p>
  <p>Here is my configiration</p>
  <pre><code>  config.action_mailer.delivery_method = :smtp
      config.action_mailer.smtp_settings = {
        :address =&gt; &quot;mail.aplus.net&quot;,
        :port =&gt; 1025,
        :domain =&gt; 'www.limoexotic.com',
        :user_name =&gt; 'booking@limoexotic.com',
        :password =&gt; 'xxxx',
        :authentication =&gt; :plain,
        :enable_starttls_auto =&gt; true 
    } 
  </code></pre>