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Finding WHOIS servers using SRV records

Every TLD registry maintains data about registered domain names. They publish this data over the WHOIS protocol. Currently, 36 registries publish the location of their WHOIS servers using SRV records. For example, the .de TLD registry publishes the location of its WHOIS server in an SRV record: ❯ dig +short _nicname._tcp.de srv 0 0 43 whois.denic.de. I’ve queried …

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DMARC: A practical guide

Domain-based Message Authentication, Reporting, and Conformance (DMARC) is one of the three pillars of modern email security. DMARC works with Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) to protect against spoofing, spam, and phishing attacks. DMARC adds reporting and policy to email security: DMARC is specified in RFC 7489. How DMARC works The DMARC record for a domain …

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