Answer:
The Federal Reserve removed section 230.10 from its Regulation DD in or about 2007 when it woke up to the realization that E-SIGN doesn't provide for any regulatory implementation or interpretation.
Unless you have contracted with your customer that you will do something in the event of a bounced email notice, you aren't obligated to follow up any more than you are obliged to ensure they open and reconcile a paper statement.
I'd recommend attempting to send another email to that address (sometimes email, like the Post Office, fails to deliver to a perfectly valid address). If it again bounces, bank policy or procedure will dictate how to proceed.
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