TL;DR - When stuff is just too damn long/complicated
SPF, DMARC, DKIM
SPF (Sender Policy Framework):
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Purpose: SPF helps prevent email impersonation by specifying which servers are allowed to send emails on their behalf.
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Report: If an email fails SPF, it means the sender's claim about the email's origin is questionable.
DKIM (DomainKeys Identified Mail):
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Purpose: DKIM ensures the email you receive is unaltered and truly comes from the claimed sender by adding a digital signature.
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Report: A DKIM failure report suggests that the email's digital signature doesn't match the one associated with the sender's domain.
Record Example
Type: TXT
Domain:
Value: Notes: Must be custom generated per application and properly "assigned" almost akin to a public-private keypair.DMARC (Domain-based Message Authentication, Reporting, and Conformance):
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Purpose: DMARC builds on SPF and DKIM to provide stronger email authentication and reporting. It helps prevent email impersonation.
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Report: If you get a DMARC report, it means the sending domain is using DMARC and you're receiving feedback about the email authentication results to monitor authenticity and security.