question

Sageo-4530 avatar image
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Sageo-4530 asked YukiSun-MSFT edited

Delivery has failed to these recipients or groups:

I suddenly started getting these messages today, when emailing with people I have emailed with before and new. Multiple different people so its not that their inboxes are full. I even get it when I tested email my own private email.

Even get it when trying to send out meeting invitations.

What can I do?


Delivery has failed to these recipients or groups:
Your message wasn't delivered because the recipient's email provider rejected it.

office-outlook-itprooffice-exchange-online-itpro
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1 Answer

YukiSun-MSFT avatar image
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YukiSun-MSFT answered YukiSun-MSFT commented

Hi @Sageo-4530,

Before we go on, could you clarify the things below so that we can understand better about the situation?

  1. Which kind of email account are you using, Outlook.com, Microsoft 365 for Business or Microsoft Exchange?

  2. Are there any error code or additional information aside from the error message you shared earlier? You can check the "Diagnostic information for administrators" section of the non delivery report to see if there are any findings. If you are uncertain about what to check, you may remove all persoanl information involved such as domain name, email address, etc, and then share the information here.

  3. Since you've added the office-outlook-itpro tag which is for general issues in Outlook desktop client, so are you sending out emails via the Outlook desktop? If this is the case, it's suggested to try sending messages via the web mail and check if the error persists, this helps narrow down if the issue needs to be further invesitaged from the email account rather than the client side.

In addition, based on my research, sometimes this error may occur when the sender's IP address is blocked, so if possible, you can try testing with different devices and see the result.



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Hi @YukiSun-MSFT

We are using Microsoft 365, me and my colleagues have the same problem. Below is one of the delivery reports I got when sending to my own private email.

We use https://www.godaddy.com/ as a service. From them we got the info that someone might be hijacking our mails and use it to send spam e mails from our e mail accounts, and has temporarily blocked the sending out function

I have used both web version of Outlook, iPhone version and desktop. Same issue.

Diagnostic information for administrators:

Generating server: HE1PR0802MB2300.eurprd08.prod.outlook.com

Remote Server returned '550 5.7.705 Service unavailable. Access denied, tenant has exceeded threshold. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653 S(7136) [HE1PR0802MB2537.eurprd08.prod.outlook.com]'

Original message headers:

Received: from HE1PR0802MB2300.eurprd08.prod.outlook.com
([fe80::d529:a7d7:9328:e52c]) by HE1PR0802MB2300.eurprd08.prod.outlook.com
([fe80::d529:a7d7:9328:e52c%8]) with mapi id 15.20.4608.018; Tue, 19 Oct 2021
05:28:15 +0000
MIME-Version: 1.0
Content-Type: text/plain
Date: Tue, 19 Oct 2021 05:28:15 +0000
Message-ID:
<HE1PR0802MB2300A9B43F9A0A52DD018CD5E7BD9@HE1PR0802MB2300.eurprd08.prod.outlook.com>
Subject: test 4

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Hi @Sageo-4530,

Remote Server returned '550 5.7.705 Service unavailable. Access denied, tenant has exceeded threshold.

According to this error message, seems like your tenant has been blocked because a very large volume of suspicious email from the tenant are identified by the Exchange Online Protection (EOP) filters. For more details and the steps for solving the issue, please refer to the document below:

"Tenant has exceeded threshold" NDR when mail is sent from your organization


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