> On 20. Jun 2019, at 00:40, Thomas Smith <theitsm...@thomassmith.info> wrote:
> Hi,
> I’ve been using a combination of OpenSMTPd and spamd on OpenBSD (currently at 
> 6.5) for some time and with success. However, there are still some 
> false-negatives and I’m looking at ways of reducing those. One way is by 
> making use of RBLs.
> (I’ve evaluated delivered spam and the majority of it seems to be coming from 
> IPs that are on various blacklists but aren’t being caught by greylisting.)
> spamd doesn’t support RBLs, at least that I’ve found, it can only use lists 
> that can be downloaded locally—the particular service I’m wanting to use only 
> provides DNS-based RBLs. So that’s my problem…
> I’m looking for ways of including an RBL in either spamd or OpenSMTPd, 
> preferring to stay in OpenBSD base as much as possible. (In other words, I’d 
> prefer to not rip out spamd or replace or supplement it with SpamAssassin or 
> rspamd—I’d rather find a solution that will plugin _specifically_ for RBLs 
> without all of the other bloat that SpamAssassin and similar products bring.
> Can anyone offer some input on this please?
> I’m not opposed to writing an OpenSMTPd filter, though I’d need to locate 
> some documentation for that (I’ve looked but haven’t been able to find it, so 
> I’m probably looking in the wrong places—suggestions welcomed).

I’ve written a filter already: https://www.umaxx.net/dl/filter-dnsbl-0.4.tar.gz 
Don’t expect support, see other mails and comments from Gilles on the filter 

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