Possible FP:
zd-swx.com
This one is a tough one. On the one hand, I think this domain is used by Ziff Davis (publisher of PC Mag) for sending out some of their newsletters.
This domain was found at the top of a header of what appears to be a legitimate PC magazine newsletter. (I know, I'm not suppose to SURBL-check headers... but I do this on a limited and extremely audited basis... I only "set it and forget it" SURBL check on the message bodies.)
Anyway, zd-swx.com is registered by easydns.com. I can't figure out what easydns.com has to do with Ziff Davis? ...and why would Ziff Davis use this kind of service to send out newsletters? Am I missing something here?
Obviously, I have more questions than answers!
However, I believe that this is worth some serious investigation by someone more experienced and knowledgeable than me because ...wouldn't it be awful to SURBL-list a domain with legitimate ties to PC Magazine???
See copy of e-mail here: http://www.pvsys.com/pcmag.txt
Rob McEwen