I looked in our knowledge base and couldn't find anything about retrieving emails from the printer. I would suggest calling into our support department to speak with an analyst at 1-800-821-2797.
While I was trying to set up sending scans to mail, I accidentally enabled POP3 connection so the printer has removed every single mail I had in my inbox.
As far as I understand how POP3 works, I conclude the printer has downloaded those mails. Does anyone know how to get them back from the printer ?