There is nothing (except common sense) stopping you from sending cash in the mail to pay what you owe. These institutions are pointing out that sending cash would be stupid for you to do so because that medium/method of exchange cannot be independently confirmed or authenticated.
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There is nothing (except common sense) stopping you from sending cash in the mail to pay what you owe. These institutions are pointing out that sending cash would be stupid for you to do so because that medium/method of exchange cannot be independently confirmed or authenticated.