Hi I have successfully set up OpenLDAP on my server( red hat 6.2) And I have my mail server (I use sendmail as my mail server on another computer on red hat 7.0)And I want to set up user authentication. I mean I need sendmail to log in authenticate via ldap. but I really don't have any idea about it. could you tell me how to do it step be step? which computer do I have to install pam_ldap? what I have to do to config pam_ldap and sendmail? And does it have any pre-install before pam_ldap? Sincerely yours, Sayumporn Darunwanna Get your small business started at Lycos Small Business at http://www.lycos.com/business/mail.html