Major mailbox providers tightened bulk sender requirements starting in 2024 — authentication, easy unsubscribe, and spam-rate thresholds are no longer nice-to-haves. This video frames a practical checklist mindset: what to validate in DNS, in your ESP, and in list practices before peak season volume hits.
The requirements evolve, but the underlying theme is consistent: prove you are who you say you are, make opting out trivial, and keep complaint rates low. Programs that treated deliverability as foundational were already close; everyone else had homework to do.
Bulk senders need SPF and DKIM with alignment to the From domain, plus a published DMARC policy (even p=none counts for some provider checks — but enforcement is the long-term goal).
Transactional and marketing streams both need to pass — do not fix marketing while leaving receipt or password-reset mail on a legacy subdomain without auth.
Providers watch spam complaint rates closely — stay well below published thresholds (often cited around 0.1% for Gmail). Sunset unengaged contacts, honor unsubscribes immediately, and avoid reactivating ancient lists without a warming plan.
One-click unsubscribe headers apply to promotional mail — work with your ESP to implement List-Unsubscribe and https one-click where required.
Provider rules keep tightening — what was framed as a 2024 deadline is really the new baseline. Teams that built authentication, hygiene, and monitoring into quarterly ops avoid fire drills every holiday season.
Learn more: DMARC setup guide, and Deliverability Recovery program.
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