• Mail System Install on Ubuntu (example in Saucy 13.10)

• https://github.com/indiehosters/email

There are a number of howto documents for Postfix Admin which you can use such as:

• http://pietervogelaar.nl/ubuntu-12-04-install-postfix-dovecot-and-vimbadmin/
• http://wiki.dovecot.org/HowTo/DovecotLDAPostfixAdminMySQL
• http://www.karlkatzke.com/centos-postfix-dovecot-spamassassin-postfixadmin-and-squirrelmail/
• http://en.gentoo-wiki.com/wiki/Mail_server_using_Postfix_and_Dovecot