How does DANE affect fallback behavior when DNSSEC fails?
If DNSSEC validation returns a bogus or fail state the TLSA records cannot be trusted. Depending on configuration the sending server may:
refuse to send mail which is the expected hard fail behavior for secure by default DANE implementations
- fall back to opportunistic TLS
- fall back to plaintext in rare cases
- This is why DNSSEC stability is critical for DANE use.
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