First, you have to log in to Microsoft Office 365 as an administrator or a user with administrator rights.
Click on Admin residing on the left side of the panel.
Expand the menu by clicking on Admin Centers then click on Exchange.
The Exchange Admin Center will now open in a new window. Click on mail flow and then on remote domains located in the top menu. Make sure that default is selected and click on the edit pencil icon.
Edit the the settings that are marked with the arrows, just like being displayed on the picture and click on the Save button.
That is it. Now try sending an e-mail again. You will get the e-mail just how you are used to, no more issues with winmail.dat. It is a simple fix, you just need to know where to find the right setting it in all those settings in Office365.
Did this article help you fixing the winmail.dat issue? I hope it did. As always we love to hear from you. Let us know in the comments section below!
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