On Mon, Oct 16, 2023 at 10:33:34AM +0300, Ivan Ionut via Postfix-users wrote:
> Hi, I'm using postscreen dnsbl configuration to block some spam:
>
> postscreen_blacklist_action = drop
> postscreen_dnsbl_threshold = 4
> postscreen_dnsbl_action = enforce
> postscreen_dnsbl_sites =
> zen.spamhaus.org
> b.barracudacentral.org
> bl.spameatingmonkey.net
> bl.spamcop.net
> dnsbl.sorbs.net
> dnsbl-1.uceprotect.net
> dnsbl-2.uceprotect.net
> dnsbl-3.uceprotect.net
> spamsources.fabel.dk
> rbl.abuse.ro
> bl.blocklist.de
> bl.0spam.org
> truncate.gbudb.net
> spam.dnsbl.anonmails.de
> cbl.abuseat.org
> hostkarma.junkemailfiltebeltimeblacklist.com=127.0.0.2
> rbl.dns-servicios.com
> rbl.interserver.net
> spam.spamrats.com
> ubl.unsubscore.com
> dnsbl.dronebl.org
> z.mailspike.net
> bl.mailspike.net
> dnsbl.zapbl.net
> dnsbl.cobion.com
> db.wpbl.info
This is an absurdly large list of DNSBLs. Carefully choose at most ~4
if your goal is to actually receive mail. If your goal is to be a QA
site for RBLs, by all means proceed.
> And in my logs I have this example of blocked email(a non-spam one):
>
> blocked using dnsbl-2.uceprotect.net
> blocked using spam.dnsbl.anonmails.de
The Postscreen service does not wait for all the RBLs to reply, once the
score is high enough, the rest are ignored. Some may be down, some
slow, etc.
> So only two of them, not four. And I want to know if there is a way to
> log more information about the threshold for each rejected email(maybe
> for each dnsbl_site).
Choose 2 or 3 decent RBLs, and you won't need nearly so much logging.
> zen.spamhaus.org
I get good results from just SpamHaus alone.
> b.barracudacentral.org
IIRC this list also has decent accuracy.
--
Viktor.
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