title: Swiftmailer error - what does this stack trace mean?
body: <p>I have Swiftmailer set up to set emails via turbo-smtp, and have just started getting a 566 SMTP limit exceeded error. Is this turbo-smtp telling me I've sent too many emails, or my server's ISP, or is there something else in that error that needs to be addressed?</p>
  
  <p>I'm not sending any more emails than I normally do via the day to day operation of the site.</p>
  
  <p>Here's the error:</p>
  
  <pre><code> [09-Feb-2016 01:34:02 UTC] PHP Fatal error:  Uncaught exception 'Swift_TransportException' with message 'Expected response code 354 but got code "566", with message "566 SMTP limit exceeded
  "' in /usr/local/lib/php/Swift/Transport/AbstractSmtpTransport.php:386
  Stack trace:
  #0 /usr/local/lib/php/Swift/Transport/AbstractSmtpTransport.php(281):     Swift_Transport_AbstractSmtpTransport-&gt;_assertResponseCode('566 SMTP limit ...', Array)
  #1 /usr/local/lib/php/Swift/Transport/EsmtpTransport.php(245): Swift_Transport_AbstractSmtpTransport-&gt;executeCommand('DATA\r\n', Array, Array)
  #2 /usr/local/lib/php/Swift/Transport/AbstractSmtpTransport.php(321): Swift_Transport_EsmtpTransport-&gt;executeCommand('DATA\r\n', Array)
  #3 /usr/local/lib/php/Swift/Transport/AbstractSmtpTransport.php(432): Swift_Transport_AbstractSmtpTransport-&gt;_doDataCommand()
  #4 /usr/local/lib/php/Swift/Transport/AbstractSmtpTransport.php(449): Swift_Transport_AbstractSmtpTransport-&gt;_doMailTransaction(Object(Swift_Message), 'support@songboo...', Array, Array)
  #5 /usr/local/lib/php/Swift/Transport/Abstra in /usr/local/lib/php/Swift/Transport/AbstractSmtpTransport.php on line 386
  </code></pre>
  
  <p>My Swift code:</p>
  
  <pre><code>$transport = Swift_SmtpTransport::newInstance('pro.turbo-smtp.com', 25)
  </code></pre>
  
  <p>I also tried </p>
  
  <pre><code>$transport = Swift_SmtpTransport::newInstance('pro.turbo-smtp.com', 465, 'ssl')
  </code></pre>
  
  <p>Thanks for your time and help.</p>