Colbeck, Andrew wrote:
For what it's worth, last month for every ham message we received, we received 3 spam and one-sixth of a virus.  And those numbers are *down* from the month before, because our inbound ham has been growing faster than spam.  Spam has been growing, and I'm seeing a 6 to 9% increase every month over the previous month.
We're averaging about 90% spam (goes up to +96% on weekends).  The ongoing dictionary attacks on about 20 domains helps that number a great deal.  My experience is that corporate domains are significantly less spammy, probably because of less personal use than small businesses, and more business use, and also because of the ratio of Web site listed addresses to total addresses.  I do have one client that has several hundred addresses and did the bonehead move of listing over half of their on their site, and as a result they get much more than most medium sized businesses.

Excluding the dictionary attacks, I'm not sure if spam is actually increasing, or measurably so if it is.  Your results could very well be due to the propagation of E-mail addresses from spammer to spammer, increased personal use among employees that tends to create more spam, and of course a general rise in spam rates.  Earlier this year I thought that zombie spam had gone through the roof, but in fact what was happening was isolated to the domains that started being dictionary attacked.

Matt
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