Can't send or receive emails on Outlook, error code [0x80004005-0x80004005-0x00000501]

Question

Hello,

I can't send or receive emails on my personal Outlook account. My mailbox settings say I have 9 GB out of 14 GB free.

This is the error message I get when I send an email from the System Administrator:

Your message did not reach some or all of the intended recipients.

 

      Subject:     X

      Sent:  8/4/2026 8:40 PM

 

            This message could not be sent. The client operation failed. Try sending the message again later, or contact your network administrator.

 

---

 

Diagnostic information for administrators:

---

 

Error is [0x80004005-0x80004005-0x00000501].

 

Exchange response headers:

      request-id: 4e3e0c47-957c-7e69-249c-c30820d7fa12

      X-ServerApplication: Exchange/15.21.0270.016

      X-FEServer: PH8PR05CA0013

      X-CalculatedBETarget: SA1PR12MB8920.namprd12.prod.outlook.com

      X-RequestId: {AD7DB0EF-8D3B-4590-AF7E-6EE621B36FFC}:89

      X-ClientInfo: {B4E1B210-F7C5-48B5-A194-9C7B70E44E42}:237880017

      X-ElapsedTime: 101

      X-BackEndHttpStatus: 200

      X-ResponseCode: 0

      X-RequestType: Execute

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ROPs Summary:

 

      0: ropSetProps (10) Processed(1) Completed(0)

            ROP result: 0

            Response codes: 0

      1: ropSetProps (10) Processed(1) Completed(0)

            ROP result: 0

            Response codes: 0

      2: ropFlushRecipients (14) Processed(1) Completed(0)

            ROP result: 0

            Response codes: 0

      3: ropSetProps (10) Processed(1) Completed(0)

            ROP result: 0

            Response codes: 0

      4: ropTransportSend (74) Processed(1) Completed(0)

            ROP result: 0

            Response codes: -2147467259

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Response Exceptions:

 

ROP Index: 4

ROP Associated: ropTransportSend (74)

Microsoft.Exchange.Data.Storage.QuotaExceededException: Microsoft Unified Storage is full.

   at Microsoft.Exchange.Data.EventHandler.UnifiedStorageQuota.UnifiedStorageQuotaLogic.EnforceQuota(EventHandlerEvent theEvent, ICoreItem item, MonitoringInfo& monitoringInfo)

   at Microsoft.Exchange.Data.EventHandler.UnifiedStorageQuota.UnifiedStorageQuotaEventHandler.Handle(BeforeItemSendEvent beforeItemSendEvent)

   at Microsoft.Exchange.Data.StoreObjects.EventHandler.EventDispatcher.ExecuteHandlerTEvent

   at Microsoft.Exchange.Data.StoreObjects.EventHandler.EventDispatcher.DispatchTEvent

   at Microsoft.Exchange.Data.Storage.CoreItem.PreprocessItem(String apiName)

   at Microsoft.Exchange.Data.Storage.CoreItem.TransportSend(StorePropertyDefinition[]& properties, Object[]& values)

   at Microsoft.Exchange.Data.StoreObjects.ProxyCoreItem.TransportSend(StorePropertyDefinition[]& properties, Object[]& values)

   at Microsoft.Exchange.Data.Storage.Items.CloudCacheSendProxyCoreItemDecorator.TransportSend(StorePropertyDefinition[]& properties, Object[]& values)

   at Microsoft.Exchange.RpcClientAccess.Handler.Message.TransportSend()

   at Microsoft.Exchange.RpcClientAccess.Handler.RopHandler.<>c__DisplayClass156_0.<TransportSend>b__0()

   at Microsoft.Exchange.RpcClientAccess.Handler.ExceptionTranslator.TryExecuteCatchAndTranslateExceptionsTResult

 

 

Transport-Send failed: failure enum(25), HResult(0x00000000), EC(-2147467259).

Transport-Send failed: failure enum(22), HResult(0x00000000), EC(-2147467259).

Submit-Message failed: message id(1), failure enum(13), HResult(0x80004005), EC(-2147467259).

Answer 1

Hi!

Where exactly did you see the information stating that you are using 9GB?

The error Microsoft.Exchange.Data.Storage.QuotaExceededException: Microsoft Unified Storage is full. indicates a storage issue. The storage figure you saw might not represent the total amount.

Go to https://onedrive.live.com/ > Sign in with the same account used for Outlook Classic > In the bottom-right corner, click the blue text under "Storage" > It will show the total usage across everything (Email, OneDrive, etc.).

In addition to checking this, please answer:

1. Does the problem occur with all senders or only specific ones?