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How to Fix Microsoft Graph Error 550 5.7.708 for Outbound Email
Question details
Users need to resolve an issue where external outbound emails sent via Microsoft Graph applications fail with a specific non-delivery error.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- A new or trial Microsoft 365 tenant attempts to send external outbound emails using an application integrated with Microsoft Graph, while internal messages and web Outlook continue to work normally.
- Observed behavior
- The system blocks the external outbound emails and returns error code 550 5.7.708 (Access denied, traffic not accepted from this IP) due to restricted outbound reputation.
Verify that you have Global Administrator privileges for your Microsoft 365 tenant, confirm that the required Exchange Online licenses are properly assigned, and ensure your SPF and DKIM records are correctly configured.
Request an IP Exception via the Microsoft 365 Admin Center
Because this block is enforced by Microsoft's server-level spam filters for new tenants, you must contact Microsoft Support to manually review your tenant and grant a sending exception.
Microsoft limits outbound email capabilities for new or trial tenants to protect the reputation of their IP addresses and prevent spam. Because this restriction is handled on the backend, configuration changes on your end will not bypass the error.
You need to provide specific diagnostic information to Microsoft Support to prove your sending practices are legitimate and request that the block be lifted.
Navigate to the Microsoft 365 admin center (admin.microsoft.com) and sign in using an account with Global Administrator permissions.
In the left-hand navigation pane, click on 'Support' and then select 'Help & support' or 'New service request' to open the troubleshooting panel.
In the issue description, state that you are experiencing 'Error 550 5.7.708'. Provide the complete Non-Delivery Report (NDR), your Tenant ID, the application's sending method, and the specific IP address trying to send the email.
Explicitly ask the Microsoft Support representative to review your tenant and sending IP for a sending exclusion or IP address exception so that external outbound emails can be processed.
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Frequently Asked Questions
Why am I getting error 550 5.7.708 only on a new Microsoft 365 tenant?
Microsoft places strict outbound sending limits or low-reputation blocks on new and trial Microsoft 365 tenants to prevent automated spam. This security measure restricts external emailing from applications until a manual exception is granted by their support team.
Can I fix error 550 5.7.708 without contacting Microsoft Support?
No. This specific outbound restriction is enforced at the server level by Microsoft's Exchange Online protection filters. You must open a support ticket to have the block reviewed and lifted.
Why do my internal emails work, but external emails fail with this error?
The strict IP and tenant reputation checks are designed to monitor outbound traffic sent to external domains. Internal mail routing within your own tenant is considered trusted and bypasses these specific outbound spam restrictions.
What information should I include in my Microsoft support ticket for this issue?
To expedite your request, include the full Non-Delivery Report (NDR) text, your Microsoft 365 Tenant ID, a description of the application's sending method, and the IP address that is attempting to send the blocked emails.
