On 21 Aug 2007, Kai Schaetzl said: > Nix wrote on Tue, 21 Aug 2007 09:26:18 +0100: > >> It's not dynamic, but Botnet isn't just looking for dynamic IPed hosts, but >> also hosts with e.g. the string `adsl' in its rDNS, even if that host happens >> to have a static assignment. > > Well, if it's static they can give you rDNS and you can use a hostname of > your > choice for A and PTR.
My ISP doesn't give me that option (well, OK, it probably gives *me* that option because I can bug the ISP's technical director, but not people who've posted bonds). I'd venture to guess that the vast majority of small business UK ISPs, even those that do not provide useful outbound relaying MTAs, do not delegate rDNS to individual users. (Of course, this is all sophistry to an extent: right now the vast majority of mail sent directly from ADSL lines *is* probably sent from botted hosts. :( )
