You can check storage page: https://onedrive.live.com/?v=managestorage see if you can free up something over there. Also if go through recycle bin carefully, if nothing is really important, empty it. Finally raise a support ticket with MS Support, they should be able to investigate why those bounceback are coming from your account.
My hotmail account is not receiving email
My Hotmail account using Outlook - Microsoft exchange via laptop, iPhone Outlook email is not receiving emails. I am able to send emails from my hotmail account, but when an email is sent to the Hotmail account an error message is displayed - The recipient's mailbox is full and can't accept messages now. Please try resending your message later, or contact the recipient directly.
I have checked Outlook > File and not that 14.2GB is free out of 14.8GB.
Error includes - Remote server returned '554 5.2.2 mailbox full; STOREDRV.Deliver.Exception:QuotaExceededException; Failed to process message due to a permanent exception with message [BeginDiagnosticData]Microsoft Unified Storage is full. QuotaExceededException: Microsoft Unified Storage is full.[EndDiagnosticData] [Stage: DeliverMessage]'
Outlook | Windows | Classic Outlook for Windows | For business
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ChristyZhang-MSFT 26,126 Reputation points Microsoft External Staff
2023-04-20T02:48:20.8466667+00:00 Hi @Cindy Chiu Chong ,
Welcome to our forum!
Based on my research on this error, i found an article which mentioned the same error as yours. Please refer to it and try the suggestions:
"554 5.2.2 mailbox full" when sending emails to a mail-enabled public folder
Hope the above help!
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