If the "next day" item is being deposited into an account that does not belong to the payee of the check, the item becomes an ordinary local or non-local check and is subject to both case-by-case and exception holds.
If the "next day" item is being deposited into an account of the payee, but is not being deposited in person, availability must be made by the second business day following deposit, unless an exception hold reason applies. This is spelled out in 229.10(c)(2).
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions