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The NetBSD project is a good place to start when looking for a mail server. Straight forward and precise, NetBSD can power some of the largest networks on the internet. To install NetBSD, follow the easy to understand installation wizard. There are several differences found in NetBSD than FreeBSD or OpenBSD.

Simply add these configuration settings to the rc.conf file in /etc

rc_configured=YES
ifconfig_fxp0=192.168.0.10/24
ifconfig_fxp1=10.1.10.100/24
sshd=YES
hostname=mail.nvita.org
sendmail_enable=yes
defaultroute=10.1.10.1
samba=YES
smbd=YES
nmbd=YES

As you can you see here, ifconfig_fxp1 incorporates the input "inet" and "netmask" but in IP notation, where the subnet mask is abriviated. These provisions are an example of how NetBSD is a viable network operating system. For example, make sure the correct default route is listed correctly. To list the correct default route, make sure the entry coresponds to the interface that will answer internet data.

If your internet service provider includes equipment which assigns a dynamic ipaddress, update the address:

dhclient fxp1

Change the new address in /etc/rc.conf

Next, install the post-fix mail system. Run the following commands:

pkg_add ftp://ftp.netbsd.org/pub/NetBSD/packages/current-packages/NetBSD-4.0/i386/All/postfix-2.6.20080903.tgz

Find the correct postfix configuration file with the find command:

find / -name "master.cf"

/usr/share/examples/postfix/master.cf
/usr/pkg/share/examples/postfix/master.cf
/usr/pkg/etc/postfix/master.cf
/usr/local/sbin/master.cf
/var/db/pkg.refcount/files/usr/pkg/etc/postfix/master.cf
/etc/postfix/master.cf

The default configuration file that postfix will use is located in the /etc directory. The master.cf configuration file determines what network interfaces to use. Here, we would like to use all the available interfaces such that users are able to send mail on the internal network as well as the external network:

vi /etc/postfix/master.cf

Press the ESC key

Type :ins

Type: smtp inet n - n - - smtpd

Strike CTRL - C

Press the ESC key

Type: wq!

Next modify the main.cf file in the /etc directory:

Type vi /etc/postfix/main.cf

Press the ESC key

Type :ins

Type:

myhostname = mail.nvita.org
inet_interfaces = mail.nvita.org
mydomain = nvita.org
myorigin = mail.nvita.org
virtual_alias_maps= hash:/etc/postfix/virtual
virtual_alias_domains = nvita.org, inverselog.com, giantfood.nl
mynetworks = 192.168.0.0/24, 127.0.0.0/8, 10.1.10.0/24

Strike the ENTER key

Strike CTRL - C

Press the ESC key

Type :wq!

Next, create the file /etc/postfix/virtual:

Type vi /etc/postfix/virtual

Press the ESC key

Type :ins

@nvita.org squirrel
mkearney@nvita.org squirrel

Strike the ENTER key

Strike CTRL - C

Press the ESC key

Type :wq!

Now create the virtual user database used by the postfix deamon:

postmap virtual

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