Some email types are now exempted from DND
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Three email types now reach contacts even when their email channel is marked Do Not Disturb (DND): Payments (Invoices), calendar notifications, and system notifications. These transactional and time-sensitive messages are no longer skipped for DND contacts, while marketing and promotional email still respects DND — this is not a blanket bypass of the setting.
See Understanding Do Not Disturb (DND) Status for how DND works and how to manage it on a contact record.