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

Posted on 2016-07-19
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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?
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Question by:ptsolutionsinc
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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)
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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.
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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.
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