ScotNet DNSBL Policy
Zone: bl.scott.ovh

Purpose
- Protect mail systems from active abuse, not punish mistakes.
- Listings are evidence-based, time-bounded where possible, and reversible with proof of control.

What we block
- Direct spam emission (repeat patterns)
- Open relays / open proxies
- Malware / botnet-driven SMTP activity
- Persistent abusive behaviour and policy violations

What we do not block
- Single transient misconfigurations (unless persistent)
- Greylisting delays
- Content-based heuristics (this is IP reputation)
- One-off mistakes without repeat activity

Return codes (IPv4)
- 127.0.0.2  Direct spam emission detected
- 127.0.0.3  Open relay or proxy
- 127.0.0.4  Malware / botnet behaviour
- 127.0.0.10 Policy block / repeat abuse

Return codes (IPv6)
- ::2 Direct spam emission detected (IPv6)
- ::3 Open relay or proxy (IPv6)
- ::4 Malware / botnet behaviour (IPv6)

IPv4 vs IPv6
- IPv4 listings apply to a single address.
- IPv6 abuse may rotate across delegated ranges; listings may apply at /64 prefix scale where appropriate.

Delisting
- Delisting requires DNS-based proof of control.
- Publish TXT record: _delist.<your-domain> TXT "delist-<token>"
- The domain must resolve (A/AAAA) to the listed IP.