Create new 'error' category #37
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…n.spamhaus.org and cbl.abuseat.org
felmoltor
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The 'error' classification returned by zen.spamhaus.org and cbl.abuseat.org should not be considered the IP as being 'listed' in the 'unknown' category. This leads to many false positives.
I created the 'error' category for the DSN responses '127.255.255.252', '127.255.255.254', and '127.255.255.255' as described here: https://www.spamhaus.org/faqs/domain-blocklist/#291:~:text=The%20following%20special%20codes%20indicate%20an%20error%20condition
I modified the logic of process_results to prevent these entries form being added as "denylisted" entries.
Also removed the provider 'cbl.abuseat.org' as it behaves as zen.spamhaus.org and it's redundant. This also prevents us from having to define a custom provider cloning the logic of ZenProvider class.