'''Answer''': Domains use public records (DNS) to direct requests for different services (web, email, etc.) to the machines that perform those services.All domains already publish email (MX) records to tell the world what machines receive mail for the domain.
| | Domains use public records (DNS) to direct requests for different services (web, email, etc.) to the machines that perform those services. All domains already publish email (MX) records to tell the world what machines receive mail for the domain.
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With SPF, those "reverse MX" records are easy to publish: one line in DNS is all it takes.
| | With SPF, those "reverse MX" records are easy to publish: one line in DNS is all it takes.
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