Just a note folks, whilst investigating why the domains associated with botnets weren't resolving (been receiving a plethora of e-mails for everything from SendSpace to HM Revenue and Customs to HSBC etc etc), I did a check on OpenDNS's servers and discovered an issue with their Lodon based server (still failed to resolve even after a cache check).
All of their other servers are unaffected by whatever is causing the issue, and correctly resolve these domains.
As an FYI, the following is a list of those from the latest e-mails;
NB: The subject with "email@example.com" in it, for those unaware, is the subject used for the OWA lookie-like, and contained whatever e-mail address it was being sent to, i.e. firstname.lastname@example.org
NB: The URL with "email@example.com" in it, for those unaware, is the URL used for the OWA lookie-like, and contained whatever e-mail address it was being sent to, i.e. firstname.lastname@example.org
NB: A few were failing to resolve at the time of posting this, I've included them in the list anyway for the sake of clarity
Incase you've not also noticed, those with numbers in the hostname, also appear to be valid where the number is 0-9, for example;