https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6335
Summary: add domain-only and IP-only lookups for URIDNSBL, for
Spamhaus DBL
Product: Spamassassin
Version: 3.3.0
Platform: Other
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P5
Component: Plugins
AssignedTo: [email protected]
ReportedBy: [email protected]
from Spamhaus:
At MAAWG in a few days time Spamhaus will release the Domain Block List (DBL),
a URI blocklist along the lines of SURBL/URIBL. The zone is currently up and
running on our public mirrors (just not announced yet) as: dbl.spamhaus.org
Obviously it's designed primarily for use in SpamAssassin so we'd like you guys
to implement URIBL_DBL as quickly as possible :) however there is a technical
difference to SURBL/URIBL in that the DBL only lists domains (domain.tld) and
not IP addresses. This difference is technically important because we would
like to actually prevent people making IP address queries to the DBL.
Spamhaus's public DNSBL serving infrastructure is always under very heavy load
so we do what we can to cut unnecessary traffic. A lot of users wrongly set
their MTAs to query non-existent zones such as "rbl.spamhaus.org" or
"bl.spamhaus.org", so we correct that quickly by using this DNS return to stop
this sort of traffic before it can get going:
1.2.3.4.rbl.spamhaus.org IN A 127.0.0.2
1.2.3.4.rbl.spamhaus.org IN TXT "SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX"
We would like to do the same for the DBL zone, which -if the query was for an
IP address- would produce this return:
1.2.3.4.dbl.spamhaus.org IN A 127.0.0.2
1.2.3.4.dbl.spamhaus.org IN TXT "SPAMHAUS DOMAIN BLOCKLIST WRONGLY USED AS AN
IP BLOCKLIST, MUST FIX"
SpamAssassin at least for URIBL makes both name and IP queries, so we don't
know if SpamAssassin will by default try to query IP addresses against DBL too.
Can you tell us if it will or not?
What we would like is for Spam filters that analyze URIs to decide if the
hostname is a domain name or an IP address, and query the appropriate DNSBL
list, in our case that would be:
Domain name: URIBL_DBL
IP address: URIBL_SBL
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