Email Unsubscribe

Record an opt-out the recipient asked for outside email, for example in a reply, a phone call or a support ticket. The address is trimmed and lowercased. Adds a marketing unsubscribe for the shop and address when none exists, and sets marketing_consent to false on the shop's customer with that address. Marketing mail from automations is then skipped for the address. A repeat call changes nothing and returns the existing unsubscribe. An unsubscribe cannot be listed or removed, and a later consent change on the customer does not remove it.