邮件服务器配置SPF和DKIM防止被误认为垃圾邮件

参考资料:

spf语法:http://www.openspf.org/SPF_Record_Syntax
spf验证:http://www.kitterman.com/spf/validate.html
dkim.org:http://www.dkim.org/
Debian下配置Postfix+dkim:https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy
Centos下配置Postfix+dkim:https://kn007.net/topics/postfix-advanced-to-use-the-new-dkim-signature-opendkim/

Debian下配置postfix+dkim+dmarc:https://www.skelleton.net/2015/03/21/how-to-eliminate-spam-and-protect-your-name-with-dmarc/

配置验证测试:http://www.mail-tester.com/

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