What kind of tunneling method is this?

I'm trying to determine what kind of proxy/tunneling method this guy is talking about. He are a few quotes from him:

It works from a simple Tunneling Technology I wrote in the last few years for some very prominent spammers. It was named Holland Tunnel, and it was incorporated into LincolnSX a major mailing software. (I was all over c|net radio 2 years ago for this). It works like this: the engine connects to an X/MTP device and establishes a tunnel through it and connects to the destination IP, the destination IP thinks it's communicating with the source IP of the X/MTP however, it is being tunneled from: Holland - X/MTP - Destination. No these X/MTP's are not proxy/socks those are easy to track and reveal. And since there are over 1 million X/MTP's out there, each connection appears to come from a completely orginal source

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Holland Engine was originally written to allow spammers to conceal their orginating IP from mailservers and to keep it from appearing in email headers. It is the core of LincolnSX, the most powerfull mass-emailing software, running at rates of 5 Million emails per day per machine. Holland Engine will actually tunnel through the internet and connect to the desired IP address where a XMTP server sits. It is this tunneling that makes LincolnSX so valuable.

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So what exactly is an "X/MTP" device and what port are they usually on? I can't find too much info online. The concept sounds very interesting, but I have to wonder if the author is full of it. He says there are over a million of these devices out there, yet there's hardly any info on them.While searching, I found a site referring to XMTP (XML MIME Transformation Protocol), but I don't know if it's the same thing he's referring to or not. I don't see how one could use that to tunnel HTTP traffic thru. It's not even an official protocol, so I doubt that a million people are using it, let alone many devices supporting it.