On Fri, 24 Nov 2006 23:51:23 -0600, Bookworm <[EMAIL PROTECTED]> wrote:
>Marc Perkel wrote: >> >> >> Kelly Jones wrote: >>> I know that most (90%+) email sent now is spam, but what are the >>> numbers for people who use spam filtering? >>> >>> I realize it varies by user, sensitivity to false positives, tools >>> used, etc, but do people who use spam filtering find that only 10% of >>> the messages they receive are spam? 25%? 50%? higher? >>> >>> I'd like something quasi-official if possible, so I can tell my >>> bosses: according to this report, even with diligent spam filtering, >>> xx% of the email people receive is still spam. If fewer than xx% of >>> your email is spam, we're ahead of the curve. >> >> Well, I'm in the spam filtering business and it varies creatly per >> domain. I have a few domain that only 1 in 10,000 messages are good. >> By those with the worst spam tend to need my services more. >> >I'm not in the spam filtering business - I just maintain about 40 >domains on 10 different servers, and run basic filtering on each. At a >guess (if anything, it'll be a low guess, because I'm not going to >overestimate), I manage to block, delete, or mark approximately 70% of >the spam that attempts to get into my servers. > >33,104 emails entered into the server (approximately 2000 a day are >blocked immediately with rblsmtpd - it varies day by day, this last 30 >hours it was only 1,600) in the last 17 days. (adding those in, it was >probably about 65,000 spams) > >Of those 33104, 22311 were marked or deleted as spam, and another 227 >were zapped by ClamAV. > >Thus, from the original, we know we've tagged 67% of the incoming email >as spam. If you add in the immediately blocked emails (of which, I've >received zero false positive reports, and zero reports of 'didn't get my >email' - and this company complains CONSTANTLY about any email issues), >then the percentage of emails blocked/marked is 83.9% of total incoming. > >Mind you, that means that I'm missing a lot of spam - of those 11,000 >emails that were left, probably half to three quarters were spam, but >that's a lot better than they would see if they were with just about any >other mail provider. (most hosting companies are CRAP for filtering). > >Bookworm Computing > > Like bookworm I don't run a spam filtering business, I just run a similar number of domains. In the last 30 days that break down as follows: HAM % HAM SPAM % SPAM TOTAL 24,289 24.17 76,217 75.83 100,506 Within that time period I've had 7 False Negatives and 5 False Positives. The bulk of spam is stopped by the use of RBLs at the MTA (a contentious issue I know), Clam, McAfee and Sophos run about level with Content Filtering, also done at the MTA. SA has accounted for around 10% (showing a significant rise in the last 2 months). http://www.blue-canoe.com/stats/index.php?D1=8 shows spam by type http://www.blue-canoe.com/stats/index.php?D1=9 shows year to date totals http://www.blue-canoe.com/stats/index.php?D1=10 shows last 30 days totals HTH Nigel
