Hi @Jaz Wills
Welcome to our forum!
What is your account type? Outlook.com or other type.
Are there any error messages when sending and receiving emails?
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In addition, based on my research, the recent inability to send and receive emails can be caused by a temporary error in the background.
The engineering team is currently working on a restoration. Please be patient and wait for the next update. Also, regarding this issue, you can contact your administrator to follow up on the latest updates in the Microsoft 365 admin center.
Thank you for your understanding and patience!
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