Glossary definition

SPF lookup limit

The SPF lookup limit is the maximum number of DNS lookups an SPF evaluation may require before receivers treat the record as too expensive to process.

How GTM Inboxes uses this term

GTM public DNS tools and domain setup guides frame SPF as an advisory pre-readiness check, not seed-placement proof or launch approval.

Why the limit shows up in launch work

SPF failures can cause readiness and authentication investigations before a workspace ever reaches seed testing. Fixing the record early avoids false confidence in domain capacity.

How to respond

Remove unused includes, consolidate senders, keep one SPF record, and rerun DNS checks before treating the domain as ready for broader review.

Related glossary terms

DMARC alignment

DMARC alignment is the match between the visible From domain and the authenticated SPF or DKIM domain used to evaluate a message.

Return-path

The return-path is the envelope sender address that receives bounces and commonly determines which domain SPF evaluates.

DKIM selector

A DKIM selector is the selector value in a DKIM signature that maps to a public key record under the sending domain.

Related workflows

Generate an SPF record

Build a planning SPF record while avoiding obvious record-shape mistakes.

Check a real domain

Move from the definition to a practical DNS and authentication check.

Seed placement workflow

How the concept shows up in the pre-launch evidence workflow.

Browse the glossary

Every cold email infrastructure term GTM models, checks, or gates.

Next step

Inspect SPF, DKIM, DMARC, and MX before launch planning.

Check domain DNS