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But last year you had 99.91% accuracy (N+1).
1) new error source: Penetration of Well-Credentialed Lists
2) nearly TRIPLE the rate of incoming spams:
last year: 1140 spams
this year: 4677 spams*
3) my upstream started discarding DNSRBL spam so I lost a lot of low-hanging fruit.
* upstream DNSRBL discards at ~50% of all mail