SPF is a way to check if an email comes from a trusted network. DMARC is a system that uses SPF and other methods to prevent email spoofing. DMARC does not change how SPF works, but it makes it more strict. Some domain owners may have very loose SPF records that allow many networks to send emails for them. Domain owners should check their SPF records carefully and only allow the networks that they trust before they use DMARC.

Some mail receivers may check SPF before they check DMARC. This means that if a domain owner uses a “-” sign in their SPF record, such as “-all”, it means that they reject any email that does not pass SPF. This could happen before the mail receiver checks DMARC. Domain owners who use “-all” should know this.

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