474908 Configure Postfix on FreeBSD

Hi, I need to configure a mail server to be able to send more than 60.000 email by hour. On my dedicate server i installed freebsd and i need to use this OS because this server are also a firewall and web proxy for one big site. Postfix are already installed. Just need to optimize and create some mail address. Each mail box need to have a dedicate IP address. If are not possible, i need to be able to change the IP and hostname each time i want to or the ip are in black list. The mail server don't send spam, it send newsletter from a a big forum that use smtp server to send mail. Please i need someone good.