On Thu, 24 May 2012, Matt Simerson wrote: > I have written a plugin that is currently named naughty. > > The POD has a good description of what it does and how it works. You can > read the POD here: > > https://www.tnpi.net/internet/mail/naughty.html > > The plugin is very effective at blocking spam and it has reduced my CPU > load enough to be measurable on munin graphs (which aren't exactly > granular). Read the POD at the URL above to see how and why. > > The plugin has one teensy tiny problem. Because it penalizes servers > that send spam, it occasionally penalizes a "mostly good" server. In a > week of running, it has done this exactly twice, and the two servers it > nabbed are mx.develooper.com and mx2.freebsd.org. Both are servers that > send lots of ham, and occasionally, some spam. > > I see a couple options. ... > c) Other?
You will do much less severe damage to your ham stream if you use 4XX rather than 550. Since you are only indicating a temporary delivery ban, it seems that 550 is inappropriate.
