SPF, DKIM, and DMARC: A Practical Email Deliverability Baseline

Email authentication helps receiving systems assess whether a message is authorized and whether its content aligns with the sender's domain. SPF, DKIM, and DMARC serve related but different purposes.SPF identifies which sending hosts are authorized for a domain. A domain should publish one SPF policy record rather than several competing SPF records. DKIM adds a cryptographic signature to outgoing...