anti-spam - is no 'false positives' achievable?

I'd recommend installing MailScanner. It is excellent at tagging spam and you can set it to tag at 2 different score levels (low scoring and high scoring). You can choose on a per domain basis what score levels you want to use and what actions to take (deliver, forward, delete the email). You can then configure it on a per customer basis, i.e. those willing to take the small risk of false-positives and those that are not. You will never achieve 0 false-positives, but you can get very close.

I have a free installation package for it:
http://www.webumake.com/free/mailscanner.htm

It would be fair to say that there is another solution available on cPanel servers that is configured using exiscan (a search on the forum will bring it up) but it has far less scope for per domain configuration and actions.

There are performance considerations if you also do virus scanning on servers with low memory and very high email throughput, but a normally configured server is almost always fine.

 

Yes, you can do that with MailScanner. You can quarantine all email, just spam and just viruses. You can then release them back to the user. A handy UI for this is MailWatch, though it can be tricky getting it configured:
http://mailwatch.sourceforge.net/

Without MailWatch, you would have to do it by hand from shell. MailScanner can be configured to clear down the quarantine directories on a regular basis.

 

You need a solution like this;

Jan 17 12:45:42 sever5 MailScanner[22884]: Message 1Cqawz-0000xc-JZ from 209.124.86.42 (cjwatson@xxxstarsforyou.com) to sler.us is spam, SpamAssassin (score=33.045, required 3.5, autolearn=spam, BAYES_99 1.89, CLICK_BELOW_CAPS 0.11, DCC_CHECK 5.00, DIGEST_MULTIPLE 0.10, DOMAIN_4U2 1.59, EXCUSE_3 0.12, HTML_FONT_BIG 0.14, HTML_FONT_INVISIBLE 0.04, HTML_IMAGE_RATIO_06 0.13, HTML_MESSAGE 0.00, RAZOR2_CF_RANGE_51_100 0.06, RAZOR2_CHECK 5.00, SARE_HTML_MANY_BR05 0.89, SARE_HTML_MANY_BR10 1.37, SARE_HTML_TITLE_SEX 0.69, SUBJECT_SEXUAL 2.90, UPPERCASE_25_50 0.03, URIBL_JP_SURBL 4.00, URIBL_OB_SURBL 4.00, URIBL_SBL 1.00, URIBL_WS_SURBL 4.00)

And you can expect about ZERO spam. In 4 days we have 4 msgs stuck in the queue and those were sent outbound by one of our users. Its not spam. So in 4 days 99% of spam is being killed off. Since Cpanel has closed OFF the use of PM's, i couldnt reply personally but if you need more information on this solution contact me, somehow.

 

No, they haven't.

 

I recommend you check out Webumake's anti spam solution as it has made a huge improvement to both my servers anti spam abilities

 

I'll second that. The price he charges isn't worth my time even attempting it. :D

 

and chirpy updated the mail scanner plugin for me months after using the service