Virus Attack!

W32/Beagle.A, an email virus, has been hitting our email server recenly, from the amount of emails titled "Hi" coming into Postfix. We have emails from a friend in Singapore, but originated from the BigPond network. Emails from Korea and Hong Kong, etc - suddenly all our friends decided to come in and say "Hi" with an executable in the attachment. Not the kind of happy new chinese year message we want...