This morning I received a text and email from outlook.com regarding a test 
account I have there, this is an account we push a low volume of mail through 
to test some authentication and deliverability stats.

> We think that someone else might have accessed the Microsoft account 
> *******@outlook.com. When this happens, we require you to verify your 
> identity with a security challenge and then change your password the next 
> time you sign in.
> 

I logged in, reset the password etc. and then checked the activity log, 
everything was as expected apart from this entry.

What's odd here is that 2603:1036:301:2171::5 is allocated to Microsoft itself.

Could someone from Microsoft provide insight into what's going on here?

--

 Marc Bradshaw - Deliverability/Abuse at FastMail
m...@fastmailteam.com | @marcbradshaw <https://twitter.com/marcbradshaw>

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