title: How to add a ptr (reverse DNS) record for office 365
body: <p>I am a bit stuck. I have set up an Office 365 installation with the proper settings. But when I send an email I get the message. 
  Incorrectly configured PTR record. All the DNS settings are correct (at least that indicates office 365). </p>
  
  <p>The website is running on a different server of course. And we do not use the nameserver of Office 365.</p>
  
  <p>So my question, where do I need to add the PTR record and what value does it have?</p>
  
  <p>I have added the DNS record below :)</p>
  
  <p><a href="https://i.stack.imgur.com/ae0pJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ae0pJ.png" alt="enter image description here"></a></p>