Disable mail forward throug MS Graph

Question

Hi,

I want to disable "email forward" programmatically. Could you please help whether it can be possible through MS graph?

Answer 1

There is way to unsubscribe way to opt out:

Submits a email request on behalf of the signed-in user to unsubscribe from an email distribution list. Uses the information in the List-Unsubscribe header.

Message senders can use mailing lists in a user-friendly way by including an option for recipients to opt out. They can do so by specifying the List-Unsubscribe header in each message following RFC-2369.

Note In particular, for the unsubscribe action to work, the sender must specify mailto: and not URL-based unsubscribe information.

POST /users/{id | userPrincipalName}/messages/{id}/unsubscribe  

This feature is only available in the beta version.

For more infromation: https://learn.microsoft.com/en-us/graph/api/message-unsubscribe?view=graph-rest-beta&tabs=http&viewFallbackFrom=graph-rest-1.0

Answer 2

It depends how forwarding has been configured if its a Mailbox Rule there you should be able to just delete the rule https://learn.microsoft.com/en-us/graph/api/messagerule-delete?view=graph-rest-1.0&tabs=http it can also be configured as part of the Out of Office setting or potentially even calendar delegates.

If its been configured using Set-Mailbox eg https://learn.microsoft.com/en-us/exchange/recipients/user-mailboxes/email-forwarding? then you can't use the Graph to unset it you need to use Exchange cmdlets eg ExoV3. You can do it in an app using https://learn.microsoft.com/en-us/powershell/exchange/app-only-auth-powershell-v2?view=exchange-ps