ldapsearch question

[Jay Hall]

I am running the following against an Active Directory server.

ldapsearch -D "cn=admin_user,cn=users,dc=xx,dc=com" -x -w "password" - 
h 10.129.10.42 -p 3268 -b 'dc=abc,dc=com' -s sub '(! 
(objectclass=computer))' '(!(mail=*))' dn mail

I am trying to return only objects for which the mail attribute is  
defined.  I think my search is incorrect, and I am searching for the  
mail attribute being null.

Any suggestions would be greatly appreciated.

Thanks,


Jay