I want to know the cause of this problem. I can't send an email ?!

Question

when sending an email Show me this text message Please this causes a lot of problems at work the message:

Delivery has failed to these recipients or groups:

******@hotmail.com
Your message wasn't delivered because the recipient's email provider rejected it.


Diagnostic information for administrators:

Generating server: PRAPR09MB5506.eurprd09.prod.outlook.com

******@hotmail.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) [PAVPR09MB6184.eurprd09.prod.outlook.com 2023-04-15T08:44:47.143Z 08DB37B336985459]'

Original message headers:

Received: from PRAPR09MB5506.eurprd09.prod.outlook.com
 ([fe80::4173:628e:27c8:eabd]) by PRAPR09MB5506.eurprd09.prod.outlook.com
 ([fe80::4173:628e:27c8:eabd%6]) with mapi id 15.20.6277.046; Sat, 15 Apr 2023
 08:44:47 +0000
MIME-Version: 1.0
Content-Type: text/plain
Date: Sat, 15 Apr 2023 08:44:47 +0000
Message-ID:
	<******@PRAPR09MB5506.eurprd09.prod.outlook.com>
Subject: test

Answer 1

Hi @Kacpersdz ,

According to the information, the error message is "Remote Server returned '550 5.7.705 Service unavailable. Access denied, tenant has exceeded threshold. " When there are too much spam or bulk mail has been sent from your organization so Microsoft blocks users in your organization from sending outgoing emails.

Here is a link about this error for your reference: "Tenant has exceeded threshold" NDR when mail is sent from your organization

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.