What’s the connection between DNS trust and sender reputation?
Positive signals:
- Valid PTR with FCrDNS
- Proper SPF, DKIM, DMARC
- DNSSEC (where checked)
- Professional hostnames
- Consistent, well-maintained records
Negative signals:
- Missing PTR
- Generic/residential PTR names
- Authentication failures
- Inconsistent or broken records
Reputation contribution:
- DNS configuration is baseline expectation
- Poor DNS = likely not a legitimate sender
- Good DNS = passed first test (not sufficient alone)
- DNS quality is table stakes for sender reputation.
Proper ship documentation is expected. Missing papers suggest illegitimate operation.
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