We've had this discussion before and I recall no cite which even required an NSF notice to be sent, regardless of whether the item was paid or returned.
Certainly it is a customer service convenience. If I had a problem I would want to be notified of it right away.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell