samba - Apr 2004 - Authentication problem using userid@mydomain.com format

I've just upgraded to Samba 3.0.2a from 2.2.8a, and I've run into a 
problem.  We have an automated build process for our Windows PCs where 
first a Windows XP Pro image is copied onto the machine, then after a 
reboot the local administrator is autologged on and a drive is mapped 
from the Samba server using Active Directory domain credentials.  At 
this point the new machine hasn't been added to AD yet.  The credentials 
are specified in userid@mydomain.com format, and Samba is failing to 
separate the userid from the domain so the connection is made 
anonymously (I have "guest ok = Yes" set for the share).

I've manually tested this and have found the problem only exists with 
this specific situation:

 - PC not added to AD
 - map drive using different credentials, userid@mydomain.com format

If the credentials are in mydomain\userid or mydomain.com\userid format, 
it works properly.

If I follow the same procedure on the same machine, but map a share from 
a Windows server using the userid@mydomain.com format, everything works 
properly.

Also, if the PC is added to AD, everything works if I no matter how the 
credentials are formatted.

I searched the mailing list archives, but I didn't find anything on this 
subject.

Is there a way around this behavior, or is this a bug?

Thank you.

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Jay D. Anderson                         John Deere Davenport Works
Jay (at) DW.Deere.com                        P.O. Box 4198
Phone: 563.388.4268 Fax: 563.388.4159   Davenport, Iowa 52808