Solved

Recipient email server rejects senders email (Office 365) due to incorrect PTR record

Posted on 2016-07-19
3
1,142 Views
Last Modified: 2016-07-19
I have a customer on Office 365.  When they send an email to a particular recipient, they get an error:

A security check at "recipientdomain.com" failed due to misconfigured settings at "sendersdomain.com."

Status code: 550 5.7.363

It appears that the recipient's email server at recipientdomain.com performed a reverse DNS (rDNS) lookup security check to verify that the IP address the message is coming from is associated with the sending domain, and the lookup failed. It appears that the pointer (PTR) record for sendersdomain.com isn't set up correctly.

I know that if the sending email server is in-house, I would contact the ISP and have them create an rDNS entry but how do we fix this if the sending server is Office 365?
0
Comment
Question by:ptsolutionsinc
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 41

Accepted Solution

by:
Vasil Michev (MVP) earned 500 total points
ID: 41719643
Having your mail handled by O365 doesnt necessarily mean that the domain is 'hosted' with O365, you are most likely able to add the PTR via the domain registrar.

If it's actually hosted by O365, you can't do anything about it. The recipient's side should add it to their whitelist instead. You can open a case with O365 support, but I'm almost certain what the answer will be (for example, this recent thread: http://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_domains/domains-being-blocked-due-to-ptr-records-not-being/c5596b6d-72fc-43cb-aee8-8793a9dd870e)
0
 

Author Comment

by:ptsolutionsinc
ID: 41719664
Thanks for the info.  I will contact the recipient to see if they can whitelist the sender's domain as recommended in the link provided.
0
 

Author Comment

by:ptsolutionsinc
ID: 41719665
Thanks for the info.  I will contact the recipient to see if they can whitelist the sender's domain as recommended in the link provided.
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Round robin for Exchange 2013 4 53
external website is 16 35
Forwarding with Microsoft DNS 11 37
Demoting 2008 DC 1 15
As tax season makes its return, so does the increase in cyber crime and tax refund phishing that comes with it
How to resolve IMCEAEX NDRs in Exchange or Exchange Online related to invalid X500 addresses.
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…

737 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question