On Fri, 6 Jan 2023, joe a wrote:
Attempting to utilize the various block lists and find rejection
messages in mail headers "blocked due to usage of an open resolver".
On 06.01.23 09:49, John Hardin wrote:
Are you forwarding your SpamAssassin DNS queries to your ISP or (e.g.)
Google?
Best practice is to set up a local, non-forwarding (potentially
non-forwarding only for the DNSBL domains, see my email from a week or
so back) DNS server for your MTA and SpamAssassin to use (potentially
your entire local network as well, but that's not relevant to your
question).
DNSBL providers generally don't like requests from public DNS servers
as they aggregate a lot of requests from a lot of sources.
https://cwiki.apache.org/confluence/display/SPAMASSASSIN/DnsBlocklists
Q: My queries to a DNS-blocklist were blocked. What does this mean?
...
Resolving the block might be as simple as using your own non-forwarding caching
nameserver
https://cwiki.apache.org/confluence/display/SPAMASSASSIN/CachingNameserver
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