Xerox 7225 e-mail read receipt request (MDN)

Hi,

we recently upgraded from a WC7120 to a WC 7225.

We used read receipt request with 7120 but now we are unable to see where we can set it on new machine 7225... Where we can find this option? We have already checked knowledge base about this machine and downloaded any possible user/administrator guide but we couldn't find anything! Perhaps this function has changed name? Please, could you tell us how I can set up read receipt request? It's extremely important!

Thank you

Regards

Karina