spamassassin not lethal anymore

[Russell L. Carter]

On 01/11/17 17:24, Kurt Buff wrote:
> Snippety snip...
>
> On Wed, Jan 11, 2017 at 4:13 PM, Russell L. Carter <rcarter at 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 at 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
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