550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP

Almost every email I send via the Graph API and SMTP is rejected with the following error:

Delivery has failed to these recipients or groups:

<email redacted>

Your message wasn't delivered because the recipient's email provider rejected it.

Diagnostic information for administrators:

Generating server: ***.namprd08.prod.outlook.com

<email redacted>

Remote Server returned '550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653 AS(7171) [***.namprd08.prod.outlook.com]'

Original message headers:

Received: from DM6PR08MB4828.namprd08.prod.outlook.com

 ([fe80::8885:764:4098:b544]) by DM6PR08MB4828.namprd08.prod.outlook.com

 ([fe80::8885:764:4098:b544%7]) with mapi id ****; Thu, 9 Jan 2020

 08:45:23 +0000

MIME-Version: 1.0

Content-Type: text/plain

Date: Thu, 9 Jan 2020 08:45:23 +0000

Message-ID:

<*** Email address is removed for privacy ***>

Subject: Test 9a


This seems to be the same problem reported here:

https://answers.microsoft.com/en-us/msoffice/forum/all/550-57708-service-unavailable-access-denied/e6ff5715-0489-45b8-9cfb-8d5273136b94

https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_domains-mso_o365b/550-57708-service-unavailable-access-denied/0b40a462-6f30-4a38-a05e-023d5cab239b

I've tried:

|

Hello Cameron,

 

Thanks for your post in Microsoft community. Due to our Privacy policy, we had removed private information from your post.

 

Possible cause for this issue is “The majority of traffic from this tenant has been detected as suspicious and has resulted in a ban on sending ability for the tenant”. Generally “error 550 5.7.708 Service unavailable” occurs when sending email from known, low reputation IP addresses. Since you have already delist your IP address via https://sender.office.com, we request you to kindly provide us entire NDR via the Private Message, so we can help you to assist further.

 

Thanks and regards,

Ankita Vaidya

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Question Info


Last updated June 2, 2021 Views 1,495 Applies to: