Date: Wed, 11 Jan 2017 18:34:26 -0700 From: "Russell L. Carter" <rcarter@pinyon.org> To: freebsd-questions@freebsd.org Subject: Re: spamassassin not lethal anymore Message-ID: <cde3f2ed-7b2d-8907-c7f7-f137e4d5a96d@pinyon.org> In-Reply-To: <CADy1Ce5Q5cvhb5SKS8QzN_yFQnhCYu12dZVDup_ipw-o3%2Bw_vg@mail.gmail.com> References: <2463a238-e10f-e81d-cab1-5a7eaf774590@pinyon.org> <20170111210507.2dc39818c6e9d439abb21ee6@sohara.org> <8016faa3-5af4-6c2d-acdf-9b02f7f1afc8@pinyon.org> <CADy1Ce5Q5cvhb5SKS8QzN_yFQnhCYu12dZVDup_ipw-o3%2Bw_vg@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 01/11/17 17:24, Kurt Buff wrote: > 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. Ah. Awesome. How do I do that? Russell > > Kurt > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?cde3f2ed-7b2d-8907-c7f7-f137e4d5a96d>