DMARC
A policy that tells mailbox providers what to do when SPF or DKIM fail.
DMARC is a DNS TXT record that publishes a policy (none, quarantine, reject) and a reporting address. Google and Yahoos February 2024 bulk-sender requirements made DMARC mandatory at scale. Start with p=none, monitor reports for several weeks, then tighten.
reading this as growth and lifecycle teams
Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.
Applied to dmarc, that means weighing scheduling, event stream, deliverability, and operating track record ahead of the rest, against behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue.