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About OAUTH2 for authentication: [https://docs.microsoft.com/en-us/graph/auth-v2-user]\\
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!!!Microsoft Graph Application registration
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It requires Microsoft Graph Application registration. Start at the Microsoft azure portal:\\
[https://azure.microsoft.com/en-us/features/azure-portal/]\\
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__Application registration: __Go to the App registrations and click on New registration:\\
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[attachments|new_registration.png]\\
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Name it. Select the Multitenant and personal Microsoft accounts type. The redirect url must ends with :register_microsoft_graph_api/. Then click on register.\\
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[attachments|register_app.png]
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__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:\\
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[attachments|permission_microsoft_graph.png]\\
[attachments|permission_final.png]\\
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__Client id : __ You can find it at Azure portal -> App Registration -> Overview:\\  
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[attachments|client_id.png]\\
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__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:\\
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[attachments|new_secret.png]\\
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!!!SMTP settings\\
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Provide the smtp server used for emailing (for example : smtp.office365.com)\\
Click on Get Refresh Token button.\\
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