It is possible to use an IMAP connector to upload emails to the platform. https://connect.nuxeo.com/nuxeo/site/marketplace/package/nuxeo-imap-connector
Besides this Athento ECM feature, it is possible to use Athento SE email fetching capabilities. These capabilities allow you to define mailboxes that will be monitored by Athento. Emails (subject, body, meta information) and attached documents can be processed in order to automate work (text extraction, field extraction, automated archiving, etc.).