ISP on RBL I need them out of my registery I think

Hello,

I learned today that ATT, my backup dialup for when my high speed goes down, or I am on the road in a crappy hotel with no high speed connection, is on the SORBS RBL.

Even though I do not use ATT when my high speed works for anything at all, ATT puts it's footprint in all my emails anyway!

I use my own smtp and another company to connect to the net, Mediacom. No matter which email program I use, OL, OLE, or the email program in my ACT! contact manager, it still goes out saying to all the servers, "I come to you from ATT". Of course ISPs' subscribing to the SORBS RBL are blocking my emails from getting through.

I did not use ATT software to set up my connection with them. I used the "new connection" in OL to do it. This way I do not get ad and spy stuff on my computer.

I thought deleting my ATT connection would be enough to stop this. I thought wrong.

I guess it is something in my registry though I'm not sure. I just need to get ATT's footprint out of my computer. Any ideas? Keep in mind there is no software to uninstall. I checked.

OS XP
Pent 4
CPU 260
RAM 768

Thanks