It has taken me several months to come up with the combination of DNSBLs I posted earlier. The process was something like this: add a dnsbl, then very closely monitor (manually) the bulk folder for at least a week. On the first false positive, the dnsbl responsible would be removed, then on to testing another.
The domain has roughly 80 email accounts - here's a typical weekday's stats (in fact, Friday's): 9360 Total incoming emails 6780 invalid addresses (mostly harvesting) 1739 caught by DNSBLs 134 containing blacklisted URLs 25 trashed thru statistical filtering (2 false +'s) 11 phrase filtered 10 virus 661 delivered I'm not sure where you're coming up with the 2% figure, but if that were the case, I would have had 35 false positives on Friday. I personally reviewed ALL of the junk mail (ugh), and found 0 due to dnsbl's. In fact, the only problem I've had with them in the past couple of months was due to a client trying to email us from their "spiffy new in-house email system" which was configured as an open relay. --- "R. Scott Perry" <[EMAIL PROTECTED]> wrote: > FYI, at least 2 of those tests would each catch > about 1% of our legitimate > mail (all those tests combined would probably result > in about 2% false > positive ratio here). So while it may be very > effective for you, others > should be very careful before following the advice > (most people seem to aim > for a false positive ratio of about .1% or better). > > > -Scott > --- > Declude JunkMail: The advanced anti-spam solution > for IMail mailservers. > Declude Virus: Catches known viruses and is the > leader in mailserver > vulnerability detection. > Find out what you've been missing: Ask about our > free 30-day evaluation. > > --- > [This E-mail was scanned for viruses by Declude > Virus (http://www.declude.com)] > > > To Unsubscribe: > http://www.ipswitch.com/support/mailing-lists.html > List Archive: > http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ __________________________________ Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
