What are SPF, DKIM, and DMARC, and how do they help prevent false spam reports?

SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting & Conformance) are email authentication protocols. They verify that an email is genuinely sent from the claimed domain, reducing the likelihood of spoofing and improving sender reputation, thus decreasing the chance of legitimate emails being marked as spam.