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Scams - How spammers are using the Power Platform to send mass email messages!
Unfortunately, there appear to be rare cases where users take advantage of the Power Platform for dishonest purposes. Read this post to find out more, including how to report malicious activity.
http://powerappsguide.com/blog/post/when-and-how-to-use-mail-connector
How to report abusive use of Power Apps and the Power Platform
However, if anyone else receives malicious messages that originate from Power Platform, or happens to be the victim of some other malicious activity that originates from a Microsoft Online Service, the best thing to do is to report the activity to Microsoft through the link beneath.
https://msrc.microsoft.com/report/abuse
Following a report, Microsoft will investigate and hopefully suspend the accounts in question. Reporting such incidents is the best thing to do, in order to help protect those who are more susceptible to falling for these types of internet scams.