That behavior is usually a warning sign of "snowshoe" bulk mailing, especially when coupled with randomly named domains / hostnames
As for working directly with spamhaus .. did they specify how they do that? You might find http://www.spamhaus.org/news.lasso?article=641 worth reading On Mon, Jun 20, 2011 at 5:43 PM, Steve Richardson <steverich.na...@gmail.com> wrote: > > assignments from us for their colo. They are an email marketer. They have > requested these assignments in as many discontiguous netblocks as we can > manage. They are now asking for more addresses (a /24s worth) in even more > discontiguous blocks. What I'd like to know is whether there is a -- Suresh Ramasubramanian (ops.li...@gmail.com)