This is has been going on for weeks and driving me nuts.
I keep getting what are essentially empty emails- no from email, no subject, no body. They only show up in my Outlook for Mac. They do not show up in my Outlook Web email, or any other email accounts (Gmail). They also don't show up on my Outlook app on my iPhone. It is solely a desktop problem.
I have tried setting up rules to block this, doesn't work. I deleted the entire Outlook program on my iMac and reinstalled it, didn't work.
I know that "contoso.com" is a fake domain that Microsoft uses, so it is not spam. I just want it stopped. I cannot stand having dozens of these stupid things in my inbox or trash file every day.
Any help that any can provide to stop this insanity would be greatly appreciated. I'm using Outlook for Mac Ver. 16.16.7 (190210)
The message source looks like this: