SPF or Senders Policy Framework was formerly known as Sender Permitted From, and sometimes also called SMTP+SPF. In 2004 it became known as Sender Policy Framework.
SPF is a system that is used by a domain to prevent email spam by detecting if a sender is using email “spoofing.” Spoofing is when a sender is trying to falsify where their email originates from. An SPF record is a TXT-record in a Domain Name System (DNS). SPF records simply list all the servers that are allowed to send email from your domain.
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