This isn't really new but I guess it's good to keep banging the drum. I blogged about it back in January - https://www.spamresource.com/2022/01/querying-spamhaus-via-cloudflare-dns.html It's clear to me that Spamhaus has long taken a dim view of querying via public resolvers; but their strategy to address seems to be to block them as they run across them, thus you might find one that works for a while, but it's not a good long term strategy.
It's also not hard to get a free DQS key from Spamhaus for low volume usage: https://www.spamhaus.com/free-trial/sign-up-for-a-free-data-query-service-account/ I recommend it, as they guide you through extra steps to get the most out of the Spamhaus data beyond just simple DNSBL checks. Cheers, Al Iverson On Fri, May 13, 2022 at 11:42 AM Jarland Donnell via mailop <[email protected]> wrote: > > I'm not sure if the rest of you are seeing the same, but I've seen a lot > of errors like this lately: > > 554 Service unavailable; Client host [mail-108-mta215.mxroute.com] > blocked by sbl-xbl.spamhaus.org; Error: open resolver; > https://www.spamhaus.org/returnc/pub/74.63.16.232 > > It seems that Spamhaus is cracking down on a certain type of activity > and it has caught more than a few mail admins with their pants down. As > you can see from the error, these mail servers are configured in such a > way that they assume the connecting IP to be blacklisted when the error > is in fact about that mail server's configuration and not the connecting > IP. This may be a good time to check your own logs, if you are querying > Spamhaus, just to be sure your house is in order. > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop -- Al Iverson / Deliverability blogging at www.spamresource.com Subscribe to the weekly newsletter at wombatmail.com/sr.cgi DNS Tools at xnnd.com / (312) 725-0130 / Chicago (Central Time) _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
