Till Studer's Notes

Recent Notes

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Sender Policy Framework

  • SPF is the standardized way for a sending domain to identify and assert the mail senders for a given domain
  • Addresses the problem of any host being able to use any domain name for each of the various identifiers in the mail header, not just the domain name where the host is located
  • Defined in RFC 7208
  • SPF works by checking a sender’s IP address against the policy encoded in any SPF record found at the sending domain

Relevant Note(s): DomainKeys Identified Mail

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