Viruses, Viruses, Everywhere!
The mail servers at my ISP have been totally overwhelmed by SoBig.F. To give you an idea: We're a little tiny ISP with only a few hundred customers. We scan every inbound and outbound message for viruses, and have content filters that reject messages on a handful of exceptionally suspicious conditions (e.g., a .PIF attachment). On Wednesday, we trapped over 5,000 virus-infected messages. On a normal day, we catch about 50.
So, a 100-fold increase in virus infected emails.
I'm getting complaints from customers that webmail is unable to send. Trust me, I know. Every available socket is in use all the time. I've shifted much of the burden over to the content filters (since SoBig.F is fairly easy to identify just based on message content), so the bad ones are getting rejected quicker, but it's still a bear.
I also shifted virus notifications and other outbound delivery functions to another machine, which is helping somewhat to relieve the burden, and I modified the SMTP servers on the web servers to send directly rather than routing through our primary server.
But, in the words of a subscriber to a reefkeeping maillist: Holy Crapolly! This is nuts.