Cisco Security: Common Errors Causing DKIM Verification Failures
“…this is the first time that we have had comprehensive information on signatures that fail to verify. The study involved about 14.2 million messages with DKIM signatures, 5.33% of which failed to verify. The messages came from 16,797 different domains, 10,968 (65%) of which had 100% verification rates and 2,899 of which failed consistently.”
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a friendly linkblog covering email technology, spam prevention, "deliverability," and related topics.
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