DNS authentication diagnostic
SPF record checker
Look up a domain's Sender Policy Framework record and inspect the published sending policy.
What does SPF do?
SPF is a DNS-based policy that tells receiving systems which servers are allowed to send mail for a domain. It is one part of email authentication alongside DKIM and DMARC.
What this checker confirms
The tool reads public TXT records and identifies entries beginning with v=spf1. A published SPF record does not guarantee inbox placement, but missing or broken authentication can contribute to delivery problems.