Tag
sender-authentication
- Jun 15, 2026 SPF Evaluation and Its Ten-Lookup Budget How a receiver matches a sending IP against a domain policy written in TXT records, why the recursion limit exists, and what each result value actually permits. internet protocols
- Jun 2, 2026 DMARC Alignment Between Header and Envelope Domains How DMARC combines two independent authentication results into one verdict, why alignment is stricter than either check, and what the policy record actually authorizes. internet protocols
- Apr 1, 2026 ARC and Authentication Across Forwarding Hops How a chain of seals lets a receiving domain trust authentication results recorded before a message was forwarded, and where that trust stops being safe. internet protocols