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Spamrats
RATS No-PTR (Spamrats)
Lists IPs sending without a valid PTR / rDNS record.
- DNS zone
noptr.spamrats.com- Target
- IP addresses
- Severity
- low
What it lists
noptr.spamrats.com lists IPs that send SMTP without a valid reverse DNS record.
Who gets listed
IPs missing rDNS or with invalid PTR entries.
Reputation impact
Low at major providers (they enforce rDNS independently) but meaningful at smaller MTAs.
How to delist
Configure a valid PTR record that matches the forward A record (FCrDNS), then request delisting.
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