DMARC
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DMARC（基于域名的邮件验证、报告和一致性）是建立在[[spf-record|SPF]]和[[dkim|DKIM]]基础上的电子邮件认证协议。它告诉接收邮件服务器在邮件未通过验证时应如何处理，并提供关于电子邮件滥用的报告。
示例
A DMARC policy of 'v=DMARC1; p=reject' instructs receiving servers to reject any email claiming to be from your domain that fails SPF/DKIM checks.