Learn how to fix the Sendmail 400 bad request Graph API error. Our Sendmail Support team is here to help you with your questions and concerns.

Graph API Sendmail 400 bad request | Troubleshooting Tips

If you have been running into the “Graph API sendmail 400 Bad Request” error, it can be a frustrating experience. This error usually tells us that there is a problem with the request. In other words, the server is unable to understand or process it.

Common Reasons causing the error:

• Incorrect Request Format
• Missing or Incorrect Headers
• Invalid Recipient or Sender Information
• Insufficient Permissions
• Invalid Attachments or Content
• Rate Limiting

Troubleshooting Tips

1. To begin with, we have to make sure that our request sticks to the correct format as specified in the Microsoft Graph API documentation. It is a good idea to double-check the syntax and structure of our request payload.
2. Next, we have to check if we have included the necessary headers in our request, especially authentication headers and content-type headers. Additionally, make sure the values are correct.
3. We also need to verify that we are adding valid and correctly formatted email addresses for both the sender and recipient fields. Double-check for typos and syntax errors.
4. Then, check if the authenticated user or application has the needed permissions to send emails using the Microsoft Graph API. We can adjust the permissions as needed.
5. In case we are including attachments, we have to make sure that they stick to the required formats and do not contain any errors. It is also a good idea to verify that file paths for attachments are accurate.
6. As Microsoft Graph API sets rate limits on requests, we have to check if we are exceeding these limits. In other words, we have to make sure our application is making requests within the allowed limits.
7. Furthermore, we need to review the error response from the Microsoft Graph API or more information about the issue causing the 400 Bad Request error.
8. Our experts recommend using logging and debugging mechanisms in our application to capture more details about the request and response. This makes it easier to pinpoint the specific point of failure.
9. Another way to avoid the error is by checking for network issues, firewalls, or proxy configurations that prevent successful communication.
10. Additionally, we need to make sure the Microsoft Graph API library or SDK is up-to-date.

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Conclusion

In brief, our Support Experts demonstrated how to fix the Sendmail 400 bad request Graph API error.