Cold email reply rates dropped 30% in Q1 2026. The deliverability stack that still lands inboxes

Q1 2026 cold email reply rates dropped 30% across most B2B outbound stacks after Gmail and Yahoo enforced stricter SPF, DKIM, and DMARC requirements. The infrastructure stack that still lands inboxes: dedicated sending domain, full DMARC enforcement, 21-day warming, BIMI for high-volume senders. Reply rates back to 5-7%.