Second part first. Many states do not allow fees on dormant account, so check that before you implement the fee.
Also, implementing the fee is probably a change in terms requiring customer notification.
Finally, the customer has a specified period of time to review the statement and report any discrepancies. Not mailing the statement extends your risk of fraud on the account.
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Al Miller, CRCM
Opinions expressed are my own and not necessarily shared by my employer.