Unverified50% confidenceFactExact time
DKIM signatures are independent of the transmission path; even if an email is forwarded multiple times, the signature remains valid as long as the signed portion has not been modified, compensating for SPF's shortcomings in forwarding scenarios.
1
Sources
50%
Confidence
Long-term
Relevance
8/11/2026
First Seen
Sources
Related Claims
VerifiedDKIM通过非对称加密为邮件头部添加数字签名，验证邮件在传输过程中未被篡改79% similarUnverifiedSPF declares authorized IPs via DNS TXT records, DKIM adds a digital signature to email headers via asymmetric encryption to verify that content has not been tampered with, and DMARC defines handling policies for authentication failures and provides aggregate reports.74% similarVerifiedThe SMTP protocol was designed without a built-in authentication mechanism, making email spoofing relatively easy to this day and requiring supplementary verification mechanisms such as SPF, DKIM, and DMARC74% similarUnverifiedSPF验证的是信封发件人（Return-Path）而非用户可见的头部发件人字段，且在邮件转发场景下容易失效71% similarUnverifiedDMARC is an email authentication protocol built on top of SPF and DKIM that allows domain owners to tell receiving parties how to handle emails that fail authentication.71% similar
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