AdmiNotes by Christopher Harvey
04/20/2004 04:37:51 PM - Spam Statistics

Permalink Spam Statistics




We use a hybrid approach to stopping spam.  We use SpamKiller to score the message and then in the 'before new mail arrives' agent we add 5 to the score if it has been tagged by an RBL (we use only Spamhaus and Spamcop).  Then based on that score, users can send to a quarantine and/or JunkMail folder.

One week ago, I started saving my Spam.  These stats are from 9am Tuesday April 13 to April 20.
Count
Percent
1401
70.8%
blocked to quarantine (score over 8)
389
19.6%
JunkMail folder (score over 4.8)
190
9.6%
Inbox
1980
Total

> Previous statistics from 3 days during the first week of March.
Count
Percent
516
71.8%
blocked to quarantine (score over 8)
162
22.5%
JunkMail folder (score over 4.8)
41
5.7%
Inbox
719
Total

  • Compared to only 6 weeks ago you can see that the % to my inbox is significantly higher
  • SpamKiller and RBLs still block over 90%, but are less effective
  • The average number per day went from 240 to 283 (18% increase)
  • 1679 of the messages (85%) of the messages were tagged by Spamcop or Spamhaus
  • 175 messages (almost 9%) were scored over 5.0 but were not tagged by a Blacklist, so SpamKiller is still earning it's keep
Another quick RBL statistic - From 9:00 to 12:30 today we had 1016 inbound smtp messages, of which 541 were tagged by Spamcop or Spamhaus.  That's over 50% in the middle of the day.  I would guess that the percentage goes way up over night.  At this point, I am hoping for a hard line on just blocking these before we receive them instead of our current tagging approach.



Comments

Comment posted by Chris Linfoot04/27/2004 10:13:20 AM
Homepage: http://chris-linfoot.net


Perhaps the native whitelisting functionality of ND7 will be what you need finally to convince people to allow you to block and not just tag?


Comment posted by Chris04/27/2004 11:43:47 AM


Yes, I still believe that the whitelisting in ND7 will be a big help for those who use DNSBL; but we won't be waiting for ND7.

I just got permission yesterday to block instead of just tagging based on RBLs

Chris, the best argument I had was what you had blogged about last July at http://chris-linfoot.net/plinks/CWLT-5PXCBN . Thanks again for that post.


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