[Samba] Adduser failing to accept 'username$'

[Casper Helenius]

Hi group,

For some odd reason - most likely my current level of n00bness - my 
useradd refuses to accept the $ in the machine name, when adding a 
Windows machine to my Samba 3 installation.

I'm running Red Hat linux with a newly compiled version of Samba 3.0.14a.

Any ideas?

Best regards,

Casper Helenius,
Denmark