What DNS issues commonly cause “no reverse DNS” rejections?
Missing PTR record:
- No PTR configured for sending IP
- dig -x IP returns NXDOMAIN
- Many receivers reject outright
PTR does not resolve forward:
- PTR exists but hostname has no A record
- FCrDNS fails
- Treated as invalid
Generic PTR:
- Names like 192-0-2-1.dynamic.isp.com
- Indicates residential/dynamic IP
- Often rejected or penalized
Resolution:
- Configure meaningful PTR (mail.yourdomain.com)
- Create matching A record
- Verify with dig -x and forward lookup
Ships without proper registration papers denied harbor entry. Generic papers trigger inspection.
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