If a picture can share 1000 thoughts , then how much a series of running pictures, video can share our thoughts.
On belief on the same i found this youtube video helps me to configure a production Mail server and will help you the same as a best proactive follow it.
Postfix : MTA (Mail Transfer Agent)
Roundcube : Web based IMAP/ MTA Agent
Openldap : Directory Server
Dovecot : IMAP/POP3 Server.