> > I have synced win2k03 group cn=users,dc=domain,dc=tld and FDS group > ou=people,dc=domain,dc=tld. > (The default groups , i have not touched the schema) > 1)Are the attributes for any user in the two servers the same? If > there are attributes that are there in AD and not in FDS or vice > versa , does it simply ignore it during the sync? The attributes listed in the documentation are sync'ed. Others are ignored. (the list is slightly different for groups vs. users). > 2)When using this setup for Postfix authentication from the FDS , do > we need to add any additional attributes in the AD or the FDS (Since i > intend to use the AD for user creation) to get the postfix > authentication working? Dunno. Obviously postfix will expect some schema. You can either try to sync that over from AD, in which case it'd need to conform to the sync'ed attributes list mentioned above. Or you'd need to add the postfix-specific attributes on the FDS side. > 3)Lastly does postfix work with LDAP with the default installation > along with RHEL? The documentation in > http://www.postfix.org/LDAP_README.html specifies configuration > options for use with OpenLDAP .Is it the same for FDS? Not sure, but this may help: http://www.ldapsource.com/content/ldap_postfix.html It seems that Postfix can be configured to use whatever attribute names you want, so you may be able to use standard schema at least in the case that you aren't doing virtual domains.