SPF Audit Checklist for Multi-Vendor Environments

### Executive summary — This guidance presents an SPF audit checklist for enterprises operating in multi-vendor environments, outlining pre-creation steps (complete sender inventory, auditing existing DNS/SPF records, monitoring readiness via DMARC, and stakeholder alignment), best-practice SPF record creation and syntax (prefer include, avoid +all, use -all for enforcement, respect the 10-DNS-lookup limit), post-publication review (inspect DMARC aggregate reports within 48–72 hours), and how Sendmarc can provide ongoing visibility, reporting, and policy management to prevent authentication failures and compliance gaps.