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How to Fix Microsoft 365 Email Error 550 5.7.708 Access Denied
Question details
Users are unable to send emails via Microsoft 365 and receive a bounce-back message with error code 550 5.7.708 indicating access is denied by the recipient's provider.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Sending outbound emails to external recipients, commonly experienced by new Microsoft 365 customers or trial tenants.
- Observed behavior
- Outbound email messages are rejected, returning a Non-Delivery Report (NDR) with error 550 5.7.708. Changing devices or internet networks does not resolve the sending failure.
Ensure you have Microsoft 365 Administrator privileges, as standard users cannot resolve tenant-level IP block issues. Have your Non-Delivery Report (NDR) ready to provide to Microsoft Support.
Open a Microsoft Support Request to Unblock the Tenant IP
This is the only way to resolve the issue, as the error is caused by a tenant-level IP reputation block that only Microsoft Support can clear.
Error 550 5.7.708 typically occurs for new Microsoft 365 tenants or trial accounts that have been assigned a low-reputation IP address. Because this is managed by Microsoft's Exchange Online protection, individual users cannot bypass this block by simply changing networks.
Navigate to the Microsoft 365 Admin Center and log in using your global administrator or exchange administrator credentials.
Click on 'Support' in the left-hand navigation menu, then select 'Help & support' or 'New service request'.
Briefly describe the issue as 'Error 550 5.7.708 Access Denied' and request an investigation into the blocked sending IP address and tenant reputation.
Attach or paste the complete Non-Delivery Report (NDR) in the ticket. Ensure you include the exact error code, your sending domain, and the approximate time of the failure.
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Frequently Asked Questions
Why am I getting error 550 5.7.708 on a brand new Microsoft 365 account?
Microsoft frequently assigns shared IP addresses to new or trial tenants. If previous users of that IP engaged in spam-like behavior, the IP's reputation drops, causing recipient providers to block your legitimate emails.
Can I fix error 550 5.7.708 by changing my Wi-Fi network or device?
No. This error is triggered by the Microsoft Exchange Online server's sending IP address, not your local device or network IP. You must contact Microsoft Support to clear the server IP's reputation.
What information does my IT admin need to fix this error?
Your admin needs the complete Non-Delivery Report (NDR) you received. This includes the exact error code (550 5.7.708), the sending domain, the recipient's address, and the timestamp of the failed delivery attempt.
