Unable to send email

Occasional Visitor



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?  




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