On 9/9/22 3:24 am, Simon Hobson wrote:
> Marjorie Roome via Dng <dng@???> wrote:
>
>> I configure strict postfix rules that incoming mail should have a
>> reverse DNS.
> I find grey-listing to be by far the most effective spam blocker.
>

I use postscreen rather than grey-listing. It does much the same delay
function as grey-listing but also does timing and protocol violation checks

https://www.postfix.org/POSTSCREEN_README.html

https://www.linuxbabe.com/mail-server/configure-postscreen-in-postfix-to-block-spambots

It does require a few minutes thinking about your master.cf structure,
but that's a good thing anyway.

--

Jeremy