Unless state law or your account agreement obligates you to take additional steps to insure receipt, you can do nothing or elect to expend the time and resources necessary to attempt delivery by an alternate method.
Section 1005.9(b) of Reg. E requires you to "send a periodic statement for each monthly cycle in which an electronic fund transfer has occurred." Notice that this rule does not say anything about assuring receipt.
If there's an old thread discussing bounced e-deliveries, it may have focused on a different aspect of this question. Many banks' e-delivery agreements call for an automatic switch to paper delivery with a service charge increase if an e-delivery attempt fails. Pricing/service policies of this type are fine and would become the basis for subsequent action.
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...gone fishing.