Open Wingate Proxy

We are running Windows NT4 and Exchange5.5. I started getting returned messages from one of our vendors and the event log said that the messages were being refused and to see dsbl.org. I went there and did a list of our ip the following message was what I found. We are not running Wingate as far as I can tell. Anyone else have this kind of problem?

DSBL: Message Detail
IP: nnn.n.nnn.nn
Input IP: nnn.n.nnn.nn
Message Received: 2003/03/20 18:33:17 UTC
Message Sent By: mjt
Transport: wingate
Extended Information for Transport:
Port 23, WINGATE, connect to 205.231.29.241

Full Message:

Received: from [nnn.n.nnn.nn] ([217.23.134.193]) by recap_ca2 (NAVIEG 2.1 bld 63) with SMTP id M2003032013365822004 for ; Thu, 20 Mar 2003 13:36:59 -0500
Message-ID:
To: Subject: Open WINGATE Proxy test message
Date: Thu, 20 Mar 2003 13:36:59 -0500
From: mjt