Exibir código-fonte para DKIM

<source lang="bash">
apt-get install opendkim opendkim-tools -y
mkdir /etc/opendkim
</source>

em /etc/opendkim.conf
 ExternalIgnoreList refile:/etc/opendkim/TrustedHosts
 InternalHosts refile:/etc/opendkim/TrustedHosts
 KeyTable refile:/etc/opendkim/KeyTable
 SigningTable refile:/etc/opendkim/SigningTable
 SOCKET inet:8891@localhost

em /etc/default/opendkim
 SOCKET="inet:8891@localhost"

em /etc/postfix/main.cf
 smtp_tls_security_level = may
 # OpenDKIM
 milter_default_action = accept
 milter_protocol = 2
 smtpd_milters = inet:localhost:8891
 non_smtpd_milters = inet:localhost:8891

em /etc/opendkim/TrustedHosts
 127.0.0.1
 localhost
 *.dominio.com

em /etc/opendkim/KeyTable
 default._domainkey.dominio.com dominio.com:default:/etc/opendkim/keys/dominio.com/default.private

em /etc/opendkim/SigningTable
 *@dominio.com default._domainkey.dominio.com

<source lang="bash">
mkdir -p /etc/opendkim/keys/dominio.com
cd /etc/opendkim/keys/dominio.com
opendkim-genkey -s default -d dominio.com
chown -R opendkim:opendkim /etc/opendkim
cat default.txt
</source>

reiniciando servios
<source lang="bash">
service postfix restart
service opendkim restart
</source>

== Referências ==
* https://www.youtube.com/watch?v=Iv_9Zwqvp8A
* https://easyengine.io/tutorials/mail/dkim-postfix-ubuntu/