Bob YoungMicrosoft can still surprise us. Yesterday a client scheduled for a remote support call at 9am today. The problem was that he was receiving error messages from Microsoft saying that his mailbox was almost full. At the appointed time I connected remotely to his computer, and watched while he pulled up the message. It was an email, rather than an in-app Outlook message, so the first thing I did was examine the header to make sure it was real (it was).
Here’s the surprise: Microsoft’s “mailbox full” messages come from an email account that has no DKIM signature and no DMARC policy! This is a classic first-blush clue that an email may be either malicious or spam.
Next, I looked at File – Options, and the in-app message was there, too, so it was indeed legitimate.
I enabled autoarchive, with message deletion from the mailbox after archiving, to fix the problem. BTW, I did this as a two-step process. First, I verified that archiving was working, and the location of the archive file. With that assurance, I enabled deletion from the mailbox.
So the issue was easy enough to fix – a simple configuration error – but, Microsoft, why are you using any email accounts with no DKIM signature and no DMARC policy? Set a good example for us!
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