I run filter-dnsbl as follow:

...
filter dnsbl proc-exec "filter-dnsbl -mv zen.spamhaus.org dnsbl.dronebl.org 
bl.spamcop.net"
...
listen on egress tls pki keys filter dnsbl
...

To be clear: filters in proc-exec chooes their own "phase, so there's no
need for you to worry about that. The only thing you need to know is
which blacklists you want to use and on which listen socket they should
be executed on (and optionally where in a filter-chain if you have
multiple).

martijn@

On Mon, 2020-08-17 at 11:23 +0200, Leo Unglaub wrote:
> Hey,
> i installed the filter "filter-dnsbl" from here 
> (http://imperialat.at/dev/filter-dnsbl/) and now i want to add it to my 
> config. However, i have to admit i have no idea how to do that? In what 
> "phase" should i put this filter? I looked around but i found a couple 
> of outdated blog posts on filters, but nothing current. I also read thru 
> here 
> (https://github.com/openbsd/src/blob/master/usr.sbin/smtpd/smtpd-filters.7), 
> but i found nothing.
> 
> If someone of you has a working example on how to use that filter, could 
> you please be so kind and send it to me?
> 
> Thanks so much and greetings
> Leo
> 


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