# apt-get install dkim-filter
# vi /etc/postfix/main.cf (3行追加)
~~~
smtpd_milters = inet:127.0.0.1:8891
non_smtpd_milters = inet:127.0.0.1:8891
milter_default_action = accept
# vi /etc/dkim-filer.conf
Syslog yes
UMask 002
Domain example.net
InternalHosts /etc/mail/hosts.list
Selector alpha
Mode sv
SubDomains yes
ADSPDiscard no
KeyList /etc/mail/dkimkey.list
# vi /etc/mail/dkimkey.list
*@example.net:example.net:/etc/mail/alpha
# vi /etc/mail/hosts.list
127.0.0.1
192.168.1.0/24
# dkim-genkey -b 1024 -d example.net -s alpha
# vi /etc/bind/net/example.net
# mv alpha.private /etc/mail/alpha
# vi /etc/default/dkim-filter
# Command-line options specified here will override the contents of
# /etc/dkim-filter.conf. See dkim-filter(8) for a complete list of options.
#DAEMON_OPTS=””
#
# Uncomment to specify an alternate socket
# Note that setting this will override any Socket value in dkim-filter.conf
#SOCKET=”local:/var/run/dkim-filter/dkim-filter.sock” # Debian default
#SOCKET=”inet:54321″ # listen on all interfaces on port 54321
SOCKET=”inet:8891@localhost” # Ubuntu default – listen on loopback on port 8891
#SOCKET=”inet:12345@192.0.2.1″ # listen on 192.0.2.1 on port 12345