Overcome the strict 10-DNS-lookup limit enforced by Gmail, Outlook, and Yahoo. Flatten nested SaaS SPF records into optimized IP blocks in seconds.
RFC 7208 Section 4.6.4 dictates that email receivers (Google Workspace, Microsoft 365, Yahoo) MUST abort SPF evaluation and return a PermError if verifying the sender requires more than 10 DNS lookups. When you add multiple email senders (SendGrid, Zendesk, Google, Marketo, HubSpot), their include: mechanisms frequently trigger 3-4 nested lookups each, easily exceeding the limit and causing legitimate emails to bounce or land in Spam.
SPF flattening queries every nested domain's SPF record down to its authoritative IPv4 and IPv6 CIDR address ranges. It then compiles these into a single v=spf1 ip4:... ip6:... ~all DNS TXT record that resolves in exactly 1 single DNS lookup.
IP addresses used by SaaS providers change over time. Use ScopeKit's MailLock API to automatically monitor DNS drift and ensure continuous DMARC compliance.