[Samba] Winbind unknown parameter

[bon]

Hi all, 

I'm using winbind with PAM to create a mail server for private mails in my 
company and I would like to use the 2000 DC to authenticate the user. 

It seems to work fine except the users name I get are in the form 
DOMAIN+user and I woul like my user to have mail address like user at my.domain 
and not DOMAIN+user at my.domain. 

There is an option named : "winbind use default domain = yes" wich seems to 
be exactly what I search but winbind seems not to know this option.
Her's what I got in log.winbindd : 

[2002/10/30 18:25:30, 0] param/loadparm.c:map_parameter(1999)
 Unknown parameter encountered: "winbind use default domain"
[2002/10/30 18:25:30, 0] param/loadparm.c:lp_do_parameter(2669)
 Ignoring unknown parameter "winbind use default domain" 

By the way, there is two other options that winbind doesn't seem to 
understand : "winbind enum users" and "winbind enum group". 

Here is an extract of my smb.conf : 

  security = domain
  password server = rha
  encrypt passwords = yes
  winbind separator = +
  winbind uid = 10000-30000
  winbind gid = 10000-30000
  winbind use default domain = yes
  template homedir = /var/home/%U
  template shell = /bin/false 


I'm on debian woody, winbind (samba) v2.2.3a-6 (the one actual with woody) 

Have you an idea of what could be wrong? 

Thanks,
Jean-Michel.