Strange Folder labelled virusmails in private/var/

[JeffCGD]

I was poking around in my computer the other day, and noticed a folder which gave me a bit of concern. Located in private/var/ is a folder named virusmails, which also had some unrecognized permissions. Does anyone have an educated opinion on this? (See attached screenshots)

 

[JeffCGD]

Whoops! Should have googled the User ID on those permissions. Look like they are from a previous install of ClamAV, using the amavisd component for checking for viri in emails.

 

[Giaguara]

I saw some theories it'd be created by ClamAV - they are not.
They seem to be there by default in Mac OS X 10.5 (verified on clean system).

 

[ElDiabloConCaca]

It is produced by Amavisd, which is installed by default. Probably something to do with Mail's spam filter.