What is Apache / HTTPD ?
Apache is a freely available Web server that is distributed under an open source license. It is the most widely-installed Web server.

What is PHP ?
PHP is a scripting language originally designed for producing dynamic web pages. It has evolved to include a command line interface capability and can be used in standalone graphical applications.

What is MySQL ?

What is Postfix, Postfixadmin, Cyrus-SASL, Courier Authlib, Courier-Imap, Squirellmail ?

Postfix is a free open source mail transfer agent (MTA), a computer program for the routing and delivery of email. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail MTA.

Postfix Admin is a web based interface to configure and manage a Postfix based email server for many users.

What is Nginx ?

Nginx is (pronounced "engine X") is a lightweight web server/reverse proxy and e-mail (IMAP/POP3) proxy, licensed under a BSD-like license.

In This tutorial we will try to install Nginx web server with PHP5, PHP5 Ext, MySQL5 and Pecl-Memcache PHP module in FreeBSD7 server.

I assume you already have freebsd server up and running.
We will using port to install all packages.

Installing MySQL5