Choosing Microsoft Graph API provider as your type of connection, you can be connected to Office 365. For successful connection you need to be logged in with your Office 365 account and to enter your incoming email account. By entering incoming email, the system will automatically fill in outgoing email with same email address. If you still want to use SMTP protocol for sending emails, inside the form within settings click on checkmark “use SMTP” and fill in appropriate Office 365 SMTP parameters.