PUBLIC DNS
Check the published SPF policy.
Read the public SPF TXT record and flag missing, duplicate, or oversized policies.
SPF authorizes sending infrastructure. A domain should publish one SPF policy at the checked hostname.
A valid SPF record does not prove a message will pass DMARC or land in the inbox. For a scored MailerZ readiness scan across MX, leftover routes, SPF, DKIM, and DMARC, use Troubleshooting.
Open the full DNS diagnostic · Simulate a route in the Email Routing Lab
Cited standard: RFC 7208
SPF authorizes sending infrastructure. A domain should publish one SPF policy at the checked hostname.