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Based on Microsoft Graph REST API ( for more info see : https://docs.microsoft.com/en-us/graph/api/resources/message?view=graph-rest-1.0).

Microsoft Graph Application registration#

It requires Microsoft Graph Application registration. Start at the Microsoft azure portal:
https://azure.microsoft.com/en-us/features/azure-portal/

Application registration: Go to the App registrations and click on New registration:



Name it. Select the Multitenant and personal Microsoft accounts type. The redirect url must ends with :register_microsoft_graph_api/. Then click on register.


App permissions :
MicrosoftMails task support OAuth 2.0 client credential grant. It requests the permissions from a directory admin.