n00b problem installing postfix package

[Bryan C. Everly]

Hi,

I'm trying to set up a new 10.3 server that includes postfix and
majordomo for a BUG I'm trying to get off the ground.  I'm normally an
OpenBSD guy but I thought I'd give it a try on FreeBSD.

Anyhow, I'm wanting to follow this guide:

http://www.area536.com/projects/complete-freebsd-mail-server/postfix-youve-got-incoming/

And I'm failing right out of the gate because I can't find postfix when I do:

# pkg install postfix

It says there isn't a package with that name.  When I check
freshports, I see that there indeed is:

https://www.freshports.org/mail/postfix/

Is there something I have to do to get things pointed at the "right"
package source like I do in OpenBSD (PKG_PATH)?  I was able to install
apache and some other stuff just fine the way I currently have things
configured FWIW.

Sorry in advance if this is a dumb question but I really could use the help.

Thanks,
Bryan