Hi everyone, Long time lurker finally joins the board thanks to an annoying Airport problem! I couldn't find anything quite like this through my searches. I've got the dual-ethernete (snow) airport basestation connected to a cable modem and have been having a problem with the IP address. For some reason, the IP address I have has been blacklisted (dsbl.org) and the only problem is I can't send email through Mail on my PowerBook or Outlook on my PC laptop. I'm using the DHCP auto option, but my 'bad' IP address is listed in the grayed out area in the Airport Admin program. If I connect directly to the cable modem (without using the Airport), I can renew the DHCP lease and get a new IP address. It's only when using the Airport that it always goes back to the 'bad' address. I've even tried copying the settings from when I directly connect into the Airport, but it doesn't help. Is there any way to clear the preferences or Airport memory of this 'bad' address? I've already tried reinstalling the firmware and the various hard restarts. Any ideas to fix this problem? It all worked fine in May, then I suspended my service while out of town for the summer. When I got back, I could no longer send mail through any email programs. If there isn't a fix, is there a workaround (proxy?)? Much appreciated.