Making the message ID immutable using Prefer: IdType="ImmutableId"

Question

Hi,

I'm working with Mail endpoints in the Graph API to send and move messages from one folder to another within the same mailbox.

I have a requirement to make the message ID to be the same even after moving the message to another folder. I tried using the Immutable ID header but, the message ID is changing.

Any guidance will be helpful.

Thanks in advance.

Answer 1

Hi @Praveen Santhosh

This header needs to be included in every API request to ensure the ID remains immutable. If the message ID is still changing after including this header, it could be due to not including it in all the requests or a potential issue with the implementation.

Here's a general approach to ensure the message ID remains the same:

1. Include the Prefer: IdType="ImmutableId" header in the initial API request when creating or getting the message.
2. Use the same header when sending the message.
3. Again, include the header when moving the message to another folder.

This header only applies to the request it is included with, so it's crucial to include it in every request related to the message you want to keep the ID immutable for.

Hope this helps.

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