Email Authentication

Since February 2024 (Google + Yahoo) and May 2025 (Microsoft), proper SPF, DKIM, and DMARC are no longer best practices — they are required for any domain sending more than 5,000 messages per day to those mailbox providers. Yet, according to the EasyDMARC 2026 Adoption Report, only 7.6% of internet domains enforce DMARC. This category covers staged DMARC rollout (p=none → p=quarantine → p=reject), DKIM key rotation, SPF record troubleshooting (the 10-lookup limit is where most senders fail), and how to read DMARC aggregate reports without getting lost in the XML.