> On 20. Jun 2019, at 00:40, Thomas Smith <[email protected]> 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 <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 topic.
