Verified65% confidenceFactExact time
DKIM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
3
Sources
65%
Confidence
Long-term
Relevance
7/6/2026
First Seen
Sources
Why DMARC's NP Tag Conflicts with DNSSEC
hackernewshackernews7/5/2026
Related Claims
UnverifiedSPF 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.72% 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 DMARC70% similarUnverifiedMost mainstream email service providers use server-side encryption (encryption at rest), where emails are encrypted but the provider holds the decryption keys and can read the plaintext of emails at any time.68% similar
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