Using an outlook.com id to register on the LastPass forums, the email-id verification email from email@example.com
got tagged as potentially
(?) fraudulent. The exact warning was "Be careful! This sender failed our fraud detection checks."
I'm not sure if MS is playing 'lawyer' here by implying that failing "fraud detection checks" does not necessarily mean fraud, just that it can't be confirmed to not be fraud.
Anyway, thought the admins might want to take a look at that. (The From, Reply-To and Sender email headers are all "firstname.lastname@example.org".)