https://issues.apache.org/SpamAssassin/show_bug.cgi?id=5863
Summary: Rules to allow bypass of blacklist lookups
Product: Spamassassin
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P5
Component: Rules
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
This suggestion might take some reengineering to accomplish. But I think it
will be worth it.
Take this situation. Using forward confirmed rDNS a message is determined to
come from yahoo servers. Thus any other network tests on that IP are a waste of
resources and can lead to false positives. If the source of the email is yahoo,
hotmail, aol, etc. then nothing is gained from doing lookups on that IP
address.
Similarly, if the sending host is my bank, wellsfargo.com then it is a good
email and no other tests need to be done.
What SA needs is a way to process certain rules so that if the rule matches
then it can disable checking of other network DNS lookup rules.
Whitelist lookups for whitelisted IPs or whitelisted host names (FCrDNS) should
be able to disable all blacklist rules and lookups.
What I call yellow lists (yahoo, hotmail, gmail) if found should bypass all
white and black lists tests because the IP would not yeild and information as
to whether or not it is ham or spam.
If this capability were in SA then one could first look up yellow list by name
or IP, then look up white lists by name our IP, then look up black lists by
name or IP. The result would be far less network lookups and far greater
accuracy. Hosts that are white or yellow listed are protected from the effects
of being falsely blacklisted.
With this in place then we can build an infrastructure to build and maintain
white and yellow lists, improve accurate, improve throughput, and reduce system
load and network traffic to blacklists.
I don't know what it will take to make this happen but I'm doing it with Exim
rules and it works great. And it would work even better if others adopted this
and there were bigger and better lists than what I maintain myself.
More information about this can be found on my wiki.
http://wiki.junkemailfilter.com/index.php/Spam_DNS_Lists
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