On Wed, Sep 3, 2008 at 5:12 AM, Michael Thomas <mike@mtcc.com> wrote:
That seems to be the convention wisdom, but the science experiment as it were in blocking port 25 doesn't seem to be correlated (must less causated) with any drop in the spam rate. Because so far as I've heard there isn't any such drop. Spammers and the rest are pretty resourceful.
Let's put it this way .. a lot of ISPs have already realized that which is why port 25 blocking or management is the basics. They do that and have done that for years (and various providers elsewhere still proudly claim "hey, we do outbound port 25 blocking, we're great!!!"). The real action is in walled gardens to automatically detect and isolate botted hosts till they're cleaned up Go talk to arbor, sandvine, perftech etc etc srs