Linux Mail Server Setup and Howto Guide

Hi consultant,

                    How to configure squirrelmail to get a separate global address book for  different domains.

                  Now i am using global file in the source /var/lib/sqirrelmail/global_abook. In this file i have included all the domains addresses since in squirelmail configuration only one file is allowed and if i login in one domain it shows all the domains addresses.what i want is, when i login as user@localhost.com it should show only localhost.com addresses only, when i login as user@xxx.com it should show the address of xxx.com  only. pls help me to solve this problem. since we are planned to configure mail server for multiple domains it  is not right to show the other domains  addresses to others.