On Wed, May 9, 2012 at 11:07 AM, Bob Hoffman <bob at bobhoffman.com> wrote: > > I am starting to see a real pattern to all this. > > I would love to see someone do a case study on spam attacks. Their > system seems well honed to scale up with your defenses until they > finally have to 'appear' on their real computers like the ovh.net > servers, and many more hosts, I think you are over-analyzing. The senders are distributed and shift around whether you do anything defensive or not, and if you have ever accepted an address, even years ago with a system like qmail that accepted without checking anything, then tried to bounce bad addresses, those addresses will be on some lists that are re-tried forever no matter how many times you reject them now. I haven't watched this for a while but I used to be surprised that even though the senders were spread over hundreds of IPs, the overall rate seemed to be centrally controlled and in what would look like a dictionary attack the list seemed to be sorted, at least in big chunks, across the senders. -- Les Mikesell lesmikesell at gmail.com