I've just seen in the last 12h a new virus coming through as a Microsoft 
security update.

I've added a test like this to catch it;

header MSVIRUS          To =~ /Microsoft Customer 
<'customer\@yourdomain.com'>/
describe MSVIRUS        temp test to find new virus
score MSVIRUS           300.0

I score it 300 because this is particularly incidious; @microsoft.com is 
whitelisted on my servers to get around the Microsoft Passport signups.

I know it's not spam but this is a quick way to prevent it from spreading 
because it really does look pretty legit unless you examine the headers.

Regards,
Andrew

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