Authentication

SPF Generator

Generate a valid SPF TXT record for your domain by picking your sending services. Avoid common syntax mistakes.

About this check

Build a clean SPF record from your sending services.

Frequently asked questions

What does the SPF Generator actually check?: Build a clean SPF record from your sending services.
Is this really free?: Yes. Every on.bo tool is free, no signup required, no rate-limit tricks.
Do you store the data I check?: We log minimal metadata to keep the service healthy. Lookups themselves are not retained beyond short-term caching.