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Microsoft 365 – 550 5.7.708 Service unavailable

You recently signed up for Microsoft 365 Business and when you are trying to send emails from your CRM system you are getting below error:

Delivery has failed to these recipients or groups:

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

Diagnostic information for administrators:

Generating server: MA1PR01MB3020.INDPRD01.PROD.OUTLOOK.COM
somerecipient@gmail.com
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(8561) [MA1PR01MB2409.INDPRD01.PROD.OUTLOOK.COM]'

Original message headers:

Received: from MA1PR01MB3020.INDPRD01.PROD.OUTLOOK.COM ([fe80::149f:aa1a:c5dd:56d8]) by MA1PR01MB3020.INDPRD01.PROD.OUTLOOK.COM ([fe80::149f:aa1a:c5dd:56d8%6]) with mapi id 15.20.3805.017; Wed, 27 Jan 2021 07:56:36 +0000 MIME-Version: 1.0 Content-Type: text/plain Date: Wed, 27 Jan 2021 07:56:36 +0000 Message-ID: Subject: Test Mail Subject

Reasons and solution

Reason for this error

Here are some of the most common reasons for this error:

Your Office 365 subscription is still on trial.
You recently paid for the Office 365 subscription.
Your CRM system is calling Office 365 API from a new IP address (quite common for cloud CRM systems).

How to resolve this error?

Resolution is very simple and it usually only takes less than 30 minutes to fix this issue. Please follow the instructions below:

Raise a service request on Microsoft 365 admin center

Login to your Microsoft 365 admin portal https://admin.microsoft.com/ using admin user.
Watch the video below to raise a New service request on your Microsoft 365 admin center.
Wait for the call from Microsoft team (You should expect a call within 5 to 10 minutes after you raised the request, they are usually very quick to respond)

Wait up to 2 hours before you can send emails from your CRM

It could take anywhere from 5 minutes to 2 hours for the changes to take effect. In most cases it will only take a couple of minutes after your call with the support team.

If the issue is not resolved even after the team confirming the fix you need to repeat the same steps to raise a new request or to update the existing service request.

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Microsoft 365 – 550 5.7.708 Service unavailable

Microsoft 365 – 550 5.7.708 Service unavailable

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