On 5/13/22 10:32 AM, Jarland Donnell via mailop wrote:
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/74.63.16.232It 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 appears to me to be related to a change that Spamhaus made in their free SBL/XBL service. Namely Spamhaus went through efforts to transition users / subscribers to different query methods over the last 3-6 months. This is probably the after the fact clean up wherein they are now $BLOCKING queries coming form -- let's go with -- high volume open public recursive DNS resolvers.
Spamhaus has stated that they were going to disable access via high -- my words -- open public recursive resolvers since the very first message they published about this 3-6 months ago.
I suspect that their $BLOCKING method has progressed to false positives as a way to get email administrator's attention.
My recollection is that the planned cut off date was 6 or more weeks ago. So I feel like they gave ample grace time after the published cut off date.
This is from memory as I'd have to dig for more specific details and can't do so at the moment.
-- Grant. . . . unix || die
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