Using New Outlook on Windows for personal email, calendar, and contact management
Hi @Lisa M
I’m sorry you’ve had to spend so much time trying to resolve this, especially after repeated support contacts without a clear explanation or resolution.
Since messages appear in Sent Items but are not delivered, incoming mail has also stopped, and repairing or reinstalling Outlook did not resolve the issue, this may not be limited to the Outlook desktop application. Please first sign in to Outlook on the web and send a test message to another email address, then reply to that test message from the other account.
If the same issue occurs on the web, please check your Microsoft 365 subscription and mailbox storage, then review whether the account is restricted or whether a service issue is reported in the Microsoft 365 Service health portal. If Outlook on the web works normally, remove and re-add the account in a new Outlook profile rather than reinstalling the application again.
Because the Help option is now showing that support is blocked, please take a screenshot of that message and include it when contacting Microsoft Support through a browser. Also provide the exact account type, whether Outlook on the web can send and receive, and whether senders receive a non-delivery report.
Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.
Since this is a public forum, we will hide your personal identifiable information, and I have sent that image of yours containing your personal identifiable information in a private message so we can work together to resolve the issue. Also, please check your private message in case you want to share another screenshot to avoid leaking your PII by click on the Private Message button as show below
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