Richard, as usual, is correct. I misread the original post and didn't pick up that the message was not a true "e-mail", but rather a closed system message.
That said, I would still consider whether there is a benefit to offering customers the ability to opt out of such messages. Do you really want customers ticked off at you because they don't want to get marketing mail in their e-banking system but have no way to get rid of it?
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions