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Why are SPF records important?

SPF records are particularly important for large websites that send out a great deal of confirmation emails, such as online stores or webmail service providers. To be sure that these emails are sent and received correctly, they can place the IP address of their mail server into the SPF record of the DNS server, so mail servers of receiving parties can check if the email they receive actually comes from that particular website. This allows spam to be prevented and creates a controlled environment in which emails can be sent.

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