- Stale A/AAAA records after migrations → lower TTLs during moves, then update.
- Broken delegation (NS mismatch) → align registrar and zone.
- Missing glue for vanity NS → add glue at the registry.
- Reverse DNS missing on mail IPs → add PTR to match HELO.
- SPF lookup limits → consolidate includes; use sub‑domains.
Read more: DNS Monitoring 101 · SSL Guide. Feature: DNS Monitoring.
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