Installing a new mailserver

apt-get install openssh-server proftpd snmpd iotop iptstate atsar postfix shorewall vim awstats bmon nscd sshfs mc zip unzip bzip2 arj spamassassin pyzor razor ncftp rsync quota ntpdate ntp vacation pdnsd dovecot-common dovecot-imapd dovecot-pop3d

pdnsd - use resolvconf configuration

Set up networking in /etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
#auto eth0
iface eth0 inet static
        address 192.168.0.112
        netmask 255.255.255.0
        network 192.168.0.0
        broadcast 192.168.0.255
#       gateway 192.168.0.1
        dns-nameservers 213.75.63.36 213.75.63.70 192.168.0.1
#       dns-nameservers 192.168.0.1 192.168.0.2
#       dns-search tripnet.int internal.tripnet.int ops.tripnet.int

auto eth1
iface eth1 inet static
        address 188.204.140.195
        netmask 255.255.255.224
        network 188.204.140.192
        broadcast 188.204.140.223
        gateway 188.204.140.193
        dns-nameservers 213.75.63.36 213.75.63.70 192.168.0.1

First install Postfix

Then install Spamassassin

Follow by installing Webmail Squirrelmail for Debian

Which also installs Dovecot

Because we want the system to support IMAP functionality fully, there are some changes to to be made which will be documented further. For now, look at Converting from mbox to maildir