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Azazel90-6698 avatar image
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Azazel90-6698 asked ·

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

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.

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Hi @Azazel90-6698 ,
You means that you could successfully receive all emails, but the sender has received an NDR report.
How do you check your mailbox usage quota? Have you checked it in EAC?
Did you changed any setting before this issue occurred?
In order to better solve this issue, please share the complete DNR information with us, pay attention to covering your personal information.



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  1. We've checked mailbox usage quota on the admin interface in a web browser and also from powershell

  2. What is an EAC?

  3. No settings have been changed since before the issue cam up

  4. Today the server generating the error message was AS8PR02MB6792.eurprd02.prod.outlook.com but it changes every day

  5. What do you mean by DNR information and what exactly do I have to cover in it before sharing here?


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Hi @Azazel90-6698 ,
Sorry for not having a complete expression.
EAC refers to Exchange Admin Center, and according to the information you provided, you have checked it.
DNR refers to Non Delivery Reports, which are bounce notifications received by the sender, which contain information about why the email failed to be sent. If possible, please share with us. Since the forum is an open place, please cover any content that will expose your personal information.


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michev avatar image
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michev answered ·

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

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Azazel90-6698 avatar image
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Azazel90-6698 answered ·

Any other suggestions, anyone?

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LucasLiu-MSFT avatar image
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LucasLiu-MSFT answered ·

Hi @Azazel90-6698 ,
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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Hi @Azazel90-6698 ,
I am writing here to confirm with you how thing going now?



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Hi @Azazel90-6698 ,
Haven't received your reply for a long time. Are there any updates?



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