In order to use a Gmail account with Mailbox Importer, the Gmail account must be configured and registered as a Google Service Account using the Google API Console. For detailed information on configuring a Google Service account, see Google's documentation.
When configuring and registering your Gmail solution, keep the following considerations in mind:
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The Google Service Account must be configured with delegated domain-wide access.
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The Google Service Account must be configured with the https://www.googleapis.com/auth/gmail.modify API scope.