Postfix is automaticaly installed which the Ultimate Edition 3.8. Is this great, I don't know. If I use this for a pur workstation, it me bi not usefull. But as a server, like in me case it is great. Specially be cause I was faat up with exim4 which is ugly to configurate.
In the 3.8 distro, postfix is there, but the file /etc/postfix/main.cf is not present. Thus it doesn'start. And it's not easy to find who to start the configuration. I have no idee how to solve that problem, but eather you don't install postfix at all or you preinstall a safe local server.
I hope this help.
PS: Postfix work perfectliy now on my machine.