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About OAUTH2 for authentication: https://docs.microsoft.com/en-us/graph/auth-v2-user

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.


API permission : You also need to provide permission for the Microsoft Graph. Go to the Api permission. Click on Add permission, select Microsoft Graph. Choose Delegated permission and add the " SMTP.Send" or/and "IMAP.AccessAsUser.All" permission:




Client id : You can find it at Azure portal -> App Registration -> Overview:



Secret key : A new client secret needs to be created as well. Go to the "Certificate & secrets" and generate a new secret key. Click on New client secret:

SMTP settings
#

Provide the smtp server used for emailing (for example : smtp.office365.com)
Click on Get Refresh Token button.
Put the Client Id and Secret (from Azure App Registration) and "common" for tenant input field.