Re: incorrect spam setups cause spool messes on forwarders

telling spammers 4xx or 5xx doesn't matter, they don't listen.

yes, but interestingly, every "smtp transport" (remote ip address who connects to your tcp/25 service) who ignores 5XX (which you can tell because they come back and try the same thing again over and over) is either a spammer or the output side of a proxy (which might be hard to detect). so it turns out that ignoring 5XX is like sending up a flare, "blackhole me!". -- Paul Vixie