Bizhub C253 Scan to E-mail Prompts for From Address

We have a client with a Kyocera Bizhub C253 multifunction machine that we have setup to scan to e-mail so that they can send documents directly from the scanner.  This works great, except that everytime they scan a document, they get prompted to supply the from address.  We have checked the network settings in the web interface and supplied the device e-mail address there, and there is a field for admin e-mail which is not editable.  Will supplying the admin e-mail address make it so that the users do not have to provide the from address everytime they scan to e-mail?  If so, where do we set this?  If not how do we set the machine to automatically default to a preset from address and stop bothering the users?  All suggestions welcome.

Thanks,
Matt