title: GMail SMTP to send mail, receiving error (4.7.0), but mail is sent!
body: <p>I am using GMail SMTP server to send mails.
  And PHPMailer as the mail sending script.</p>
  
  <p>I have received this error (I log all SMTP errors, that is whenever, PHPMailer::Send fails): -</p>
  
  <pre><code>SMTP Error: Data not accepted.&lt;p&gt;SMTP server error: 4.7.0 Temporary System Problem.  Try again later (WS)
  </code></pre>
  
  <p>But the mails is actually sent. (This I know by matching the timestamp of sent mails, and the timestamp in the log.)</p>
  
  <p>How is it possible? 
  What does that error mean?</p>
  
  <p><strong>UPDATE</strong>: I think I was not clear in my question. Let me rephrase it: -</p>
  
  <p>I am <strong>not worried</strong> if a mail is lost after PHPMailer is able to send it to GMail SMTP. But I am worried that PHPMailer has returned error, but the mail was sent. Is it possible?</p>