SPF Builder
Build SPF records interactively with live validation and lookup estimation.
SPF Mechanisms
1.
2.
Generated SPF Record
Valid
v=spf1 +include: -all
TXT length: 21 / 450 characters
DNS Lookups
1/ 10 limit
Validation
Record passes validation checks.
What is SPF Builder?
An SPF builder helps you construct a valid SPF TXT record from mechanisms and modifiers with live validation and lookup estimation.
How it works
Add authorized senders and includes, preview the record, and validate syntax before publishing to DNS.
Common issues
Forgetting the v=spf1 version
Records must start with v=spf1. The builder includes the version token automatically in generated output.
Frequently asked questions
Should I use +all?
Almost never. +all authorizes the entire internet. Prefer a restrictive -all or transitional ~all with accurate includes.
Related tools
Continue with these related PacketWizard tools for adjacent diagnostics.
SPF InspectorLookup, parse, and analyze SPF records with DNS lookup counting and evaluation tree.DMARC BuilderBuild DMARC records interactively with live preview and policy explanation.DKIM InspectorInspect DKIM records by domain and selector with key strength analysis.DNS LookupQuery DNS records for a hostname or domain.