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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.


It is required to provide the from email address too.