Can't recieve emails mailbox is full but it's not

Azazel90 391 Reputation points
2021-02-24T10:22:08.283+00:00

We're using Office365 for mailing and recently our clients have told us they were getting error messages when sending us emails. The error messages tell them their email could not be delivered cause the recipient mailbox is full. However we're properly recieving every single email anybody sends us and none of our mailboxes are actuall full. We've checkend and actually none of them is bigger than 26GB and the limit is 50GB as far as I know. Is this a bug? Have anyone faced this issue before? It's really annoying cause eveyone is recieving these error messages whenever they're trying to send emails to any of our mailboxes.

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Vasil Michev 95,751 Reputation points MVP
    2021-02-24T11:22:06.747+00:00

    Which server is generating this NDR, post the sanitized version here.

  2. Azazel90 391 Reputation points
    2021-03-02T08:26:54.17+00:00

    Any other suggestions, anyone?

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  3. Lucas Liu-MSFT 6,161 Reputation points
    2021-03-02T09:57:11.033+00:00

    Hi @Azazel90 ,
    1.According to my test, when I send two emails to the same Office 365 mailbox, the emails are rejected. The DSN generation server in the two non-delivery reports emails I received is different. So I think we need more DNR information to be able to determine the cause of the issue.

    2.In addition, the specific enhanced code contained in the non-delivery reports email also corresponds to the reason that the email failed to be sent. You can refer to the enhanced code: Email non-delivery reports in Exchange Online

    3.Please run the following command to check the size limit for the mailbox.

    Get-Mailbox <mailbox> | fl *quota*

    The ProhibitSendReceiveQuota parameter specifies a size limit for the mailbox. If the mailbox reaches or exceeds this size, the mailbox can't send or receive new messages. Messages sent to the mailbox are returned to the sender with a descriptive error message. This value effectively determines the maximum size of the mailbox.

    For more information you could refer to: Set-Mailbox, there are specific introductions to these parameters.
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