Send & Receive Issues

Fix Power Automate Email Error 550 5.7.708 (Access Denied)

Rana Garcia Oct 10, 2026 869 views

Question details

The user needs to troubleshoot a Power Automate flow that successfully runs during testing but fails to deliver SharePoint notification emails due to an access denied error (550 5.7.708) from the sending IP.

How to Fix Power Automate Email Error 550 5.7.708

Product: Microsoft Power Automate
Device & OS: not provided
Scenario: Attempting to send automated SharePoint notification emails using a Power Automate flow.
Observed behavior: The flow indicates success during testing, but the actual email delivery fails with NDR error 550 5.7.708, stating access is denied from the sending IP.

Before you start

Before attempting to resolve this email delivery issue, verify that you have administrative access or know who your Microsoft 365 global administrator is, as resolving a tenant-level IP block requires advanced administrative privileges.

Solution 1Recommended

Review Message Traces and Open a Microsoft Support Ticket

This is the most effective approach as NDR error 550 5.7.708 is an Exchange Online tenant-level block that must be resolved by an administrator contacting Microsoft.

Microsoft blocks certain sending IPs at the tenant level if they suspect unusual activity or spam. This configuration cannot be bypassed through Power Automate settings alone.

Log into the Admin Center

Access the Microsoft 365 admin center using your global administrator credentials.

Run a Message Trace

Navigate to the Exchange admin center, select 'Mail flow', and run a message trace to locate the blocked SharePoint notification emails and confirm the NDR 5.7.700 series error.

Submit a Support Request

Navigate to the 'Support' section in the M365 Admin portal, create a new ticket for the service team, provide the message trace details, and request them to investigate and unblock the tenant IP.

Review Message Traces and Open a Microsoft Support Ticket

Admin Privileges Required: Only authorized Microsoft 365 administrators can submit support tickets for tenant-level IP blocks in Exchange Online.

Solution 2

Consult the Microsoft Power Automate Community

If you are not the administrator and need workflow-specific advice, gathering insights from the community can help you verify your flow configuration.

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Frequently Asked Questions

What does email error 550 5.7.708 mean in Power Automate?

This error indicates that the email could not be delivered because the sending IP address associated with your Microsoft 365 tenant has been blocked by Exchange Online. This usually happens due to a low reputation or suspected unusual mailing activity.

Why does my flow show a 'success' status if the email isn't delivered?

Power Automate reports a flow as successful when the logic executes correctly and hands the message off to the email server. The 550 5.7.708 error happens subsequently during the actual email delivery process handled by Exchange Online, which is beyond the flow's immediate scope.

Can I fix the 5.7.708 IP block myself as a standard user?

Typically, no. Unblocking a tenant IP requires Microsoft 365 administrator privileges. The administrator must review message traces and open a direct support ticket with Microsoft's service team to resolve the tenant block.

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