What is the best method to integrate Microsoft 365 email sending in my n8n workflow?

Below is some guidance for your integration:

Use the Dedicated Outlook Node

n8n provides a dedicated Microsoft Outlook node that lets you work with Microsoft 365 emails. Using this node is generally simpler than configuring the HTTP Request node manually since it comes with built‑in support for OAuth2 authentication and is tailored for email operations—provided it meets your requirements.

When to Use HTTP Request

If you need to access features not covered by the Outlook node or you want more fine‑grained control over the Microsoft Graph API’s endpoints (for example, if you need to use an endpoint that isn’t directly supported by a dedicated node), then the HTTP Request node is a powerful alternative. However, for typical email sending operations using Mail.Send permissions, the Microsoft Outlook node should be sufficient.

Best Practices

• Choose the Simplest Option: Start with the Microsoft Outlook node if it covers your needs. It simplifies authentication and reduces manual setup compared to crafting raw HTTP calls.
• Check Prerequisites: Whether you use the Outlook node or HTTP Request, ensure your Azure AD app is correctly registered, and all required OAuth2 settings (like redirect URIs, client secrets, etc.) are configured according to the Microsoft documentation.
• Workflow Environment: Make sure your n8n environment (version, database setting, execution process, etc.) is configured correctly for your use case. If you’re running into issues, reviewing the n8n logs and environment details can help diagnose potential configuration problems.

Using the dedicated node normally reduces setup complexity, but keep the HTTP Request node in your toolkit if your integration needs extend beyond its capabilities.