[Samba] domain user map

[matteo cazzador]

Is it possible with samba mappin ga nt group like Domain Users on unix 
machine.
My target is to add user to samba using a simple exe that adding users 
(USRMGR.exe), I was able to add user (the application add user in linux 
machine), but i'have problem with group.

my smb.conf containing

add user script = /usr/sbin/useradd -s /bin/false -m %u

i can't manage the group why?
the options

domain user map

can't help me?
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