I know, it might sound like a spammers request..

One of our future ZCS customer does request the following feature(ZCS NetworkEdition)
(due to personality- and spam-protection) :

Some VIPs of that company do very often not like to use their personal/secret email-addresses,
instead they would like to be able to use a one-time email address that could be generated
automatically upon composing a new email and it would be even better, if in addition, the VIP
could type/suggest the desired address himself (of course ZCS should complain,
if the suggested emailaddress is already in use (in that corporate domain).
And a lifetime(e.g. some days or weeks) of such an email- address should be defineable as well.

Is that a good idea, or would you suggest a better approach?