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For the details steps on how to set up automatic import, please see Importing Setting up Automatic Import for Supplier Invoices Automatically- Office 365 user guide.
Note: When you are using automatic supplier invoice import, there's an area where you can see the details or logs every time Ascora tries to read the emails and that is in Administration → Received Email History.
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Received Email History - for Automatic Supplier Invoice Import or Job Import