Graph API - user: sendMail - Request size limit

Question

Based on https://learn.microsoft.com/en-us/graph/errors we assume we need to handle a 413 error when calling this endpoint https://learn.microsoft.com/en-us/graph/api/user-sendmail however we are not sure what request size triggers this error

Answer 1

Hello Peter,

Thank you for contacting Microsoft Support!

A 413 error, or “Request Entity Too Large,” occurs when the request size exceeds the maximum limit allowed by the server. For the Microsoft Graph API, particularly the user: sendMail endpoint, the request size limit is generally around 4 MB. If your request exceeds this size, you will encounter a 413 error. https://learn.microsoft.com/en-us/graph/use-the-api

To avoid this, you can:

1. Reduce the size: Ensure that attachments or other data included in the request are within the size limit.
2. Use an upload session: For larger files, consider using an upload session, which allows you to upload files in chunks. https://learn.microsoft.com/en-us/graph/outlook-large-attachments?tabs=http

Hope this helps.

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