Could be luck of the draw but I hadn't actively seen any prior to 2
weeks ago. A reasonably large web host in Canada was the first I saw,
and since then it's just been a trickle of little hosts or individually
managed servers.
On 2022-05-13 11:51, Al Iverson via mailop wrote:
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.
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