- 安装程序
sudo yum install opendkim
- 生成keys
sudo mkdir /etc/opendkim/keys/mydomain.com
sudo opendkim-genkey -D /etc/opendkim/keys/mydomain.com/ -d mydomain.com -s default #mydomain.com改成自己的域名
sudo chown -R opendkim:opendkim /etc/opendkim/keys/mydomain.com
- 编辑/etc/opendkim.conf如下
AutoRestart Yes
AutoRestartRate 10/1h
LogWhy Yes
Syslog Yes
SyslogSuccess Yes
Mode sv
Canonicalization relaxed/simple
ExternalIgnoreList refile:/etc/opendkim/TrustedHosts
InternalHosts refile:/etc/opendkim/TrustedHosts
KeyTable refile:/etc/opendkim/KeyTable
SigningTable refile:/etc/opendkim/SigningTable
SignatureAlgorithm rsa-sha256
Socket inet:8891@localhost
PidFile /var/run/opendkim/opendkim.pid
UMask 022
UserID opendkim:opendkim
TemporaryDirectory /var/tmp
- /etc/opendkim/KeyTable
default._domainkey.mydomain.com mydomain.com:default:/etc/opendkim/keys/mydomain.com/default #把mydomain.com换成自己的域名
- /etc/opendkim/SigningTable
*@mydomain.com default._domainkey.mydomain.com #把mydomain.com换成自己的域名
- /etc/opendkim/TrustedHosts
127.0.0.1
mydomain.com #换成自己的域名
- /etc/opendkim/keys/mydomain.com/default.txt
default._domainkey IN TXT ( "v=DKIM1; k=rsa; "
"p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDApHRr7ZmXRaAB+RQRbP4VdMwIrIHIP18KFtXRsv/xpWc0Gix6ZXN13fcG03KNGKZo2PY+csPkGC5quDnH5V0JEhDZ78KcDWFsU6u4fr9ktVAdt6P7jWXjcyqdHOZ8+YN4cAeU4lRFNgQvdupIcByYwzPYMgBFHfJm9014HvRqhwIDAQAB" ) ; ----- DKIM key default for mydomain.com
DNS中再建个TXT项，并把括号中除去引号的所有信息填到DNS中的TXT中。
- /etc/postfix/main.cf添加如下参数
smtpd_milters = inet:127.0.0.1:8891
non_smtpd_milters = $smtpd_milters
milter_default_action = accept
milter_protocol = 2
- 设置自动启动
sudo systemctl enable opendkim
sudo systemctl start opendkim
参考文档：
http://www.linuxtechi.com/configure-domainkeys-with-postfix-on-centos-7/