Thanks for the suggestions. I haven't tried to make a hand-crafted 
absolutely minimal Linux install because that would be a hassle to maintain. 
I'm only installing the Fedora "Core" packages with a handful of extra stuff 
(fortran, for example). That way upgrading the Guest OS should just work as 
easily as upgrading the Sage source release.

I agree that sendmail can be turned off. I like sshd, though, because its a 
nice way to interact with the virtual machine. You can scp files in/out, for 
example. By default the VM doesn't punch the ssh port through its NAT for 
security, but that can be easily done in the VirtualBox settings.

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