Does anyone know if a user can go into his mailbox and enable/disable the email function? This potential customer would like the email option but wants to know if he can turn it off or on himself. We've installed a few but have never had this question come up until now. It's gonna be a TDA50 with a TVA50. Thanks in advance.

you vill have to have the LAN card installed once you have that they can connect with the TVA Console and change that but you have to be an administrator

If it's a question of they only want certain messages sent to e mail, give them a phantom mailbox, they FWD any message they want to this box.
Other than that I can't see a problem, if they have called id it's real easy, just zap the ones you don't want. Also on record button use the phantom box, otherwise its not forwarded.