ipv6 firewall?

[Rashkae]

Derek Broughton wrote:

> 
> What part of "wide open" do you get when you install postfix?  You _must_ 
> tell it which interfaces you want it to listen on, and how to send mail.  At 
> some point in there, you should be starting to worry...

Huh? Postfix, like most applications. listens on all interfaces by
default.  When you install postfix, you are only asked one question,
which is what "role" do you want it to be given.  This is probably
confusing to someone who doesn't even know what postfix is supposed to
be, (remember, in this example, we are merely installing software to
check the hard drive SMART status), but if you just press enter once to
accept the default, that's pre-configured for Internet E-mail Host.

And this was just an example I pulled from the top of my head because I
thought it was so bizzare there was no user friendly simple way to check
hard drive SMART without installing a frikking MTA.  The take away
point, it's ridiculously easy for someone to install software that opens
a port to the Internet without having any knowledge that they have done
so, which is why it's a good idea to always firewall any computer that
is directly attached to the Internet.