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Since Monday our emails sent from our domain are either being quarantined or sent to junk when any recipient is in a Microsoft domain. The same is true for emails sent to Outlook.com, hotmial.com etc. We are not having issues sending to Gmail or G-Suite or other domains. We have had the proper DKIM, SPF and DMARC records in place for years now. We don't send spam or bulk emails and we are not appearing on any blacklists. Anyone have an insight as to what could be going on since Monday that would be causing this. It is causing major communication issues with clients.
I can reproduce the issue by sending myself an email to my outlook.com and hotmail.com accounts then when I analyze the header I see the following line:
ucf:0;jmr:0;ex:0;auth:1;dest:J;OFR:SpamFilterAuthJ;ENG:(5062000308)(920221119095)(90000117)(920221120095)(90011020)(91015020)(91040095)(9050020)(9060121)(9081003)(9100341)(944500132)(2008001181)(4810010)(4910033)(9930004)(9610028)(9525003)(10140023)(9320005)(9245025)(120001)(1110175);RF:JunkEmail;
This line from the header seem to indicate to me that the message are being flagged as Junk Mail, but I cannot determine why. Even a basic test message goes directly to my junk folder unless I add sender to safe senders list, but calling all our clients and asking them to make the same changes is nearly impossible and its causing major communication issues with many of our clients.
I sent my email to a third party and they examined the header and found that we are being marked with a 9 being high confidence spam by Microsoft, but I cannot tell the reason.
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I think you need to open a ticket with microsoft here: https://olcsupport.office.com/
There can be something wrong with your authentication or something wrong in the content of you email that's causing it. Use this eMail Testerit does a good job at testing the content.
It's either going to be:
If any of your clients have an IT team, in a few clicks they should be able to check the logs and see why the message was flagged.
You being on the sender end leaves little options for troubleshooting without some recipient colaboration.
Hello and thank you for the reply, I am trying to reach out to other IT teams on the receiving end for additional troubleshooting. In the meantime I am able to duplicate the issue by sending myself emails to my @outlook.com and @hotmail.com accounts personally. Based on the headers of one of the test message I see the following line, which to me indicates that the messages are in fact being flagged as junk, but I cannot find a reason why:
X-Microsoft-Antispam-Mailbox-Delivery:
ucf:0;jmr:0;ex:0;auth:1;dest:J;OFR:SpamFilterAuthJ;ENG:(5062000308)(920221119095)(90000117)(920221120095)(90011020)(91015020)(91040095)(9050020)(9060121)(9081003)(9100341)(944500132)(2008001181)(4810010)(4910033)(9930004)(9610028)(9525003)(10140023)(9320005)(9245025)(120001)(1110175);RF:JunkEmail;
Thanks for your reply- It is hard getting hold of the IT teams of our clients as there is a lot of red tape involved before they will speak with us and getting hold of them is not easy as they are large organizations. I can reproduce the issues to my own outlook.com and hotmail.com accounts simply by sending a basic test message. When I do it will go directly to my junk folder unless I add myself to the safe senders list, but reaching out to all our clients and asking them to do the same is quite a chore. I can send the same test message to Gmail with no issues. Many of the clients we now see this issue with have been clients for years and this issue didn't start until the beginning of this week. I am trying to determine what can be done on my end to remedy this issue if anything.
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Hi @Ben ,
Welcome to our forum!
What's your accout?
Please kindly understand that the Outlook tag here we mainly focus on general issues about Outlook desktop client. In terms of Outlook desktop client, we can contact the recipients to do the below action:
You can also refer to this official article to do more actions: How to handle Legitimate emails getting blocked (False Positive), using Microsoft Defender for Office 365.
Hope to help you!
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Hi and thanks for the reply,
This does help, but continues to be an issue as not everyone seems to know this is the most simple solution. I am more wondering why this started occurring suddenly with clients to whom we have been communicating for years with no issues. We are having to call clients and tell them specifically to make sure we are added to their safe senders list etc, but it's not the most viable solution. I'd really like to know what is causing it in the first place.