http://bugzilla.spamassassin.org/show_bug.cgi?id=2944
Summary: New non-local test: age of domain names in spam
Product: Spamassassin
Version: 2.61
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P5
Component: Rules
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
I've found that spammers very frequently register a URL and then use it as a
destination for a spam email advertisement within a week of that registration.
So here is the idea:
1) extract URLs in message
2) ask whois how old the registration is for those URLs
3) score young URLs as more likely to be spam
4) score old URLS (1 year old, let's say) as less likely to be spam.
Any old url used for spam advertisements is likely to already be listed as a
known destination for spam, so it won't be easy for spammers to work around
this one.
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