DKIM
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DKIM（域名密钥识别邮件）是一种为外发邮件添加数字签名的电子邮件认证方法。接收服务器使用在[[dns|DNS]]记录中发布的公钥验证签名，确认电子邮件在传输过程中未被更改。
示例
When your email server sends a message, DKIM signs the headers and body. The recipient's server checks the signature against your DKIM DNS record.