Scan to email doesn't work because the printer displays an error message: "The current policy of the device requires that the recipient has an unlimited email address."
Other Xerox WorkCentre device has got the same address list and there is no problem with it. I compared the settings but I doesn't find the problem. Also no possible to add email address manually.
I found this article for the issue you're having with the blocked email address. If you are still having issues after trying these steps, I suggest that you call into our support department for assistance @ 1-800-821-2797.