RH6.1 Group access for shares

[Matthew Halliday]

I've set up a samba 2.0.5a / RedHat 6.1 file server.  It's all going
fine, but for a minor issue that is irritating rather than critical.  I
have directories for each dept, and then sub-dirs for users, with a dept
share dir in each dept dir.   I can set the valid users to individual
users for the shared directories but some of the depts have 25 - 30
people and so I'd like to use groups but  I don't seem able to set the
valid users setting in smb.conf to groups.  Using @ or + in front of the
group name won't allow anyone in and it keeps asking for the corect
password.  Can anyone help?

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