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                         i want steps to configure the LDAP server if any one know plz post the answers  | 
                
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                                     Look for an install tutorial or how-to on the subject. A good one that I found for you is here: http://tldp.org/HOWTO/LDAP-HOWTO/  | 
                            
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                                     Have a look at HowToForge; type in LDAP in the search box. They have a lot of easy to follow step by step guides for various distros.  | 
                            
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Not enough information. What Linux distro? Do you already have a mail server setup?