I have an O365 Premium account. I'm using Outlook from the web. I have sent email to multiple addresses, they never arrive, and there is no bounce/error message sent back. There is nothing in the Outbox and the email addresses show up in the Sent folder.
I originally created my O365 account using another email address (a Yahoo address) as my username. When I go to send mail from O365 Outlook, it uses that email as my From: email address. Don't I get an outlook.com address? How do I find out what it is? Why doesn't Outlook automatically send from it?