is there any way to set mail access for selected users (whole web/IMAP/POP) only from trusted subnets? The point is that not all our employees are allowed to use webmail from outside the company. Ideally, it would be nice to set such a thing in COS schema, but anything usable is a good solution .

I've found in other thread (http://www.zimbra.com/forums/adminis...er-domain.html):
I could see a simple filter field being added in the Zimbra Admin Console under a user to list the network(s) that they could access from - ie for no access, for the local subnet or xxx.xxx.xxx.xxx/yy for external/remote site access.
So the question is: how to do it?