RFC 7208 §4.6.4·DNS Compliance Utility
SPF 10-Lookup Auto-Flattener
Resolve SPF PermError instantly. Recursively traverse nested vendor includes (Google Workspace, M365, SendGrid, Salesforce) and compress them into authoritative, zero-lookup CIDR netblocks.
Instant Presets (>10 lookups):
The RFC 7208 Rule
RFC 7208 mandates that receiving mail systems must abort SPF checks and return a permanent error (PermError) if evaluation requires more than 10 DNS queries.
The Include Trap
Adding just Google Workspace (1 lookup) + Zendesk (3 lookups) + Salesforce (4 lookups) + SendGrid (2 lookups) puts you right at 10. Any additional tool causes silent delivery failure.
Continuous Dynamic Sync
Manual flattening is risky because providers rotate IPs. DmarcLock polls vendor networks daily and updates your published DNS automatically without manual maintenance.