Cannot send from new domain

Question

Remote server returned '550 5.7.501 Service unavailable. Spam abuse detected from IP range. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. [Moderator note: Personally Identifiable Information removed]

Answer 1

Hi Helen,

Your full error is:

Remote Server returned '550 5.7.501 Service unavailable. Spam abuse detected from IP range.'

this usually means Exchange Online has blocked mail originating from the sending IP address because it has a poor or untrusted reputation. This commonly affects new tenants, trial subscriptions, newly provisioned IPs, or environments where suspicious email traffic has been detected.

To address this issue, your tenant need to be added to a temporary sending exclusion list for up to 60 days. This allows email to be sent from IP addresses that are currently blocked while the tenant is still using a new or trial license.

Please open a support request with Microsoft Support through the Microsoft 365 Admin Center. Once the case is reviewed, the support team can determine whether your tenant qualifies for a temporary sending exclusion and advise on the next steps.

Microsoft also provides customer service phone numbers based on your region. You can find the appropriate contact number here: Customer service phone numbers - Microsoft Support 

This route ensures that a Microsoft support engineer can initiate a remote session to investigate backend configurations, run advanced diagnostic tools, and, if necessary, escalate the case to specialized teams with access to internal systems and logs. These backend resources are essential for resolving issues that go beyond what’s visible in the user interface.

As community moderators, we’re here to guide you, but due to privacy and security limitations, we don’t have access to the backend tools required for a full resolution. For this reason, contacting Microsoft Support via the Admin Center is the most secure and efficient way forward. 

 

I hope this helps you resolve the issue quickly. I’m glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.  

If you find my post helpful, kindly consider marking it as the accepted answer. Doing so can assist others in the community who may have similar questions in finding solutions more quickly.  

Thank you for your kindness and contributions to the forum. 

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