Outlook/Office365/Microsoft365 and junk mails

This issue is more to document and make people aware experiencing similar issues. Discussion, experiences or any tips to come to a solution might be helpful for everyone. --- Office 365 / Outlook is quite special when it comes to get mails from your own mailserver delivered to said providers. In a negative aspect, unfortunately. **The problem** There are many reports from users having issues to get serious legit mails delivered to Microsofts' mailing service correctly, even with state-of-the-art non-blacklisted mailservers using latest techniques like DKIM, ARC and strict SPF and being part of their JMRP and SNDS program. In most cases delivered mails are always moved into Junk/Spam folder for absolutely no reason. Important to notice: This is **not** limited to mailcow instances overall and is an ongoing issue since a quite long time. **If you have customers at Office 365 or even worse: Outlook.com** you should tell them about this issue and migrate them to another service, as they will not be able to receive legit mail from clean mail servers. Business critical mail may never reach their mailbox. This is not the senders problem, this is a **serious problem for the recipient** and therefore the Microsoft customer. Microsoft seems not to be able to handle their spam filters and tries to mitigate this problem by blocking **whole foreign networks**. **Solution** Unfortunately there is no solution available yet. Several users (including me) tried to get more information an

Posted by patschi on Aug 11, 2019, 8:31 PM

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