Outbound mail queued up at Edge Server with 451 4.4.0 DNS query failed

I have came across a couple cases with this issue as of recent and thought enough to create a blog post on, since if I see the issue on multiple people calling into MS support for an issue with the same fix, I’m sure others are experiencing it as well. I’ll keep this short and…


Exchange 2016 users unable to edit Distribution Group membership using Outlook

I’ve come across a few of these cases recently and felt obligated to put up a post about this issue. Of course you can check the basics, do they have the required RBAC role, is it a Universal Security Group, etc, or any of the causes listed HERE but the cases I’ve had and am…


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