Our iMail runs on a Windows 2003 server, but DNS is pointed to a Windows 2000 machine. My spam checks slowed down considerably when I moved to 2003, but not to the extent of minutes or hours. Rather, by 10 blacklists now take 20-30 seconds to check, whereas before they were in the 2-3 second range. Not a big annoyance; I personally don't see any problem with email being delayed by half a minute. However, I want to understand why this is happening.
Most likely, the reason for this has to do with IMail v8's anti-spam running the DNS-based spam tests in serial, rather than in parallel. That means that the second test won't start until the first one ends. So for 10 blacklists, that means that each is taking an average of 2-3 seconds to check, which could be normal.
Is anyone else hacing this experience? I'm wondering if perhaps one or more of the blacklists I am using is slowing it down. Perhaps they are non-existant. How do I check this from the command line? Here is my current list:
spamhaus * sbl.spamhaus.org D T F SpamCop * bl.spamcop.net D T F dsbl * list.dsbl.org D T F njabl * dnsbl.njabl.org D T F Spews * spews.bl.reynolds.net.au D T F reynolds * t1.bl.reynolds.net.au D T F Orid * dnsbl.antispam.or.id D T F easynet-dyna * ynablock.easynet.nl D T F easynet-bl * blackholes.easynet.nl D T F
Any one of these suspect?
Yes -- all the EASYNET-DYNA and EASYNET-DNSBL tests died about 6 months ago. I would suggest removing them.
-Scott
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