PATCH: More serverguide additions

[Rocco Stanzione]

This patch fleshes out the network configuration section with the exception of 
the wireless part.  I know just enough about wireless networking to fill that 
hole and confuse people, so I decided to leave it alone.  This patch also 
includes the beginnings of some work on the email section, which looks to 
need some attention.  I run a 
postfix/courier-imap/clamav/amavis/spamassassin/qpopper setup here, but not 
on an Ubuntu system, so maybe I'm a good last-resort guy to finish this 
section up.  If nobody else wants it, I'll set aside some time for it.  

Comments on this patch are welcome, as this is only my second non-proofreading 
attempt at contribution.

Thanks,

Rocco Stanzione
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