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What is the DMARC alignment requirement for bulk senders?
For messages sent directly to personal Gmail accounts, the organizational domain in the sender From: header must be aligned with either the SPF organizational domain or the DKIM organizational domain. Although we require bulk senders to set up both SPF and DKIM authentication, only one of these needs to be aligned to meet the sender alignment requirements. DMARC alignment isn’t required for forwarded or mailing list messages (sometimes referred to as indirect messages), however we require that these types of messages have ARC headers. Learn more about ARC authentication and headers. To ensure reliable authentication, we recommend all senders fully align DMARC to both SPF and DKIM. It’s likely that DMARC alignment with both SPF and DKIM will eventually be a sender requirement. Learn more about DMARC alignment.