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How to Fix Exchange Online SMTP Relay Error 550 5.7.64
Question details
The user needs to configure their dedicated server to send emails via Microsoft 365 SMTP, but is encountering a relay access denied error.
- Product
- Exchange Online
- Device & OS
- not provided
- Scenario
- Setting up an SMTP relay to send emails from a website hosted on a dedicated server using a Microsoft 365 account.
- Observed behavior
- The system returns the error '550 5.7.64 TenantAttribution; Relay Access Denied', preventing the website from sending outgoing emails.
Ensure you have global administrator access to the Microsoft 365 admin center and confirm the static public IP address of your dedicated hosting server.
Review and Update Exchange Inbound Connector Settings
Use this solution to verify that your Microsoft 365 tenant correctly identifies your dedicated server's IP address through an inbound connector.
The TenantAttribution error generally means Exchange Online cannot associate the incoming SMTP connection with your specific tenant. This is usually resolved by creating or updating an inbound connector.
Sign in to the Microsoft 365 Admin Center with your global admin credentials, and select 'Exchange' from the admin centers menu to open the Exchange admin center (EAC).
In the EAC, go to the 'Mail flow' section in the left-hand navigation pane and click on 'Connectors'.
Locate the inbound connector configured for your website's SMTP relay. Edit the configuration to ensure the static IP address of your dedicated server is accurately listed.
If you are in an Exchange hybrid environment, rerun the Hybrid Configuration Wizard to refresh and sync your routing and connector configurations.
Escalate via Support Ticket or Hosting Provider
Use this approach if the connector is properly configured but the error persists, especially for subscriptions managed by third-party partners.
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Frequently Asked Questions
Why do I get the TenantAttribution error when sending emails from my website?
This error occurs when Exchange Online cannot associate the incoming SMTP connection with your Microsoft 365 tenant. It is usually caused by a missing or incorrectly configured inbound connector that fails to recognize your server's IP address.
Does GoDaddy support fix Microsoft 365 SMTP relay issues?
If you purchased Microsoft 365 through GoDaddy, they act as your primary support tier. However, for complex tenant-level connector issues that they cannot resolve internally, they must escalate the ticket directly to Microsoft on your behalf.
Do I need a static IP for my website server to use Exchange Online SMTP relay?
Yes. Configuring an IP-based inbound connector for an SMTP relay in Exchange Online requires your dedicated hosting server to have a permanent, static IP address so Microsoft servers can authenticate the origin.
