On Tue, 02 Sep 2014 13:32:26 -0700 Ted Mittelstaedt <t...@ipinc.net> wrote:
> The point of blocking on DNS or IP based blocking is to issue > that error 5xx because that is the ONLY thing that is going to > cause the spammer to delist. You are an optimist, aren't you? > Because at that point they are > now wasting money and time and resources attempting to deliver > to an address that probably does not exist. Botnet users have so many resources to waste that it's cheaper for them to ignore SMTP reply codes than do anything with them. Regards, David.
