Date: Wed, 11 Jan 2017 16:24:49 -0800 From: Kurt Buff <kurt.buff@gmail.com> To: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: spamassassin not lethal anymore Message-ID: <CADy1Ce5Q5cvhb5SKS8QzN_yFQnhCYu12dZVDup_ipw-o3%2Bw_vg@mail.gmail.com> In-Reply-To: <8016faa3-5af4-6c2d-acdf-9b02f7f1afc8@pinyon.org> References: <2463a238-e10f-e81d-cab1-5a7eaf774590@pinyon.org> <20170111210507.2dc39818c6e9d439abb21ee6@sohara.org> <8016faa3-5af4-6c2d-acdf-9b02f7f1afc8@pinyon.org>
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Snippety snip... On Wed, Jan 11, 2017 at 4:13 PM, Russell L. Carter <rcarter@pinyon.org> wrote: > On 01/11/17 14:05, Steve O'Hara-Smith wrote: >> >> On Wed, 11 Jan 2017 13:45:47 -0700 >> "Russell L. Carter" <rcarter@pinyon.org> wrote: >> most of it botnet sourced. I've pretty much eliminated it now by a >> combination of installing dcc and razor plugins to spamassassin (reduced >> the spam getting through by 70% or so) and adding a backup MX with a free >> service that only accepts messages to relay when the primary is down (it's >> amazing how much spam stopped coming in when I did that). >> > > I'm not sure what you mean here, can you elaborate a bit more? I can > do anything I like with my MX hosts so I'm game. I *think* I'm > already doing that. I have multiple domains, and so I have a primary > MX and a couple of backup MX hosts (one of which is effectively a > passive dovecot replicator, lordy that works fantastic). The backup > MX hosts are lower priority than the primary. Are you doing something > different? A secondary MX that refuses mail when the primary is up and running foils one of the favorite tactics of spammers - they will often target the secondary MX because those are often not as up to date with anti-spam measures. Most spambots try one MX, one time only. Many spambots will try that secondary MX, get refused with a 4xx error, and not bother to try the primary MX at all. It can be a big win, in the right situation. Kurt
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