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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.\\
Put the Client Id and Secret (from Azure App Registration) and "common" for tenant input field.
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[attachments|smtp_get_refresh_token.png]\\
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Click on OK button, allow CrushFTP to have access to send Email. As the end of the result the SMTP Username and Password will filled the Client ID and the Refresh Token.\\
It is required to provide the from email address too.\\
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[attachments|smtp_from_email.png]\\