samba - Aug 2003 - samba 3.0, winbindd/ADS and mailaccounts, possible?

Hi list,
i wonder if the folowing szenario will be possible with samba 3.0:

a win2k domain with samba as member-server,
on the samba server runs winbindd to get the useraccounts from the
domain for filesharing and for mail send/delivery with fetchmail and 
sendmail.

I don't want to have to create the mailusers localy on the linuxbox,
the domain should be completly manageable from the win2k server.

is this possible?

Christoph