cc:Mail

These may all be dead short-circuited neurons, but IIRC there was a cc:Mail Gateway or Internet Gateway special product you needed to buy that would run on a dedicated PC box (under DOS?) and would talk in turn to your cc:Mail post office server and the 'net to exchange email messages in and out. It had the semi-annoying habit of retaining plaintext copies of all incoming or outgoing messages (one or the other, I forget which). There was also some non-trivial configuration setup required on both the Gateway and cc:Mail servers to explain all this to cc:Mail. I think there was some sort of route name or gateway name specified with email addresses, possibly with a comma after the internet address, but like I said those brain cells are almost gone.