postfix and dovecot on centos vps

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http://serverfault.com – I am setting up a Postfix Mail Server on My VPS with CentOS. I managed to install it and now its working in the website. The problem i am facing now is to make it work with users. as when i create a user he gets an email account and he can use Thunderbird or any such client to fetch emails. My Main.cf file # myhostname should be set to the DNS name of the server myhostname = server1.domain.com ----> here is my domain name mydomain = domain.com ---> here is my domain name myorigin = $mydomain mydestination = $myhostname, $mydomain # listen for connections on all interfaces inet_interfac (HowTos)