[Bug 4200] Suggestion: Domain Age as a criteria

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http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4200





------- Additional Comments From spamassassin@dostech.ca  2005-10-22 04:12 -------
FWIW, I've been doing realtime whois queries on URIs found in messages from a
small mail stream (about 3500 messages a week) for a few months.

I've found that the result only makes a difference on about 3% of the messages
that have whois queries done -- I only check messages with scores (when priority
1000 rules are called) between 0 and 10.

I limit the queries to 50 in a 24 hour period to avoid being blacklisted by a
whois service.  At 500 messages total a day, I don't think I often reach the max
of 50 when scanning messages with scores between the 0 and 10 range.


As a result, I don't think domain ages under a year are worth the effort for
scoring.  Domains that are multiple years old, with no blacklist hits, on the
other hand would likely be candidates for nice scoring.  One of these days, I'll
modify my plugin to try this theory out.



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