Added FAQ entries

[matt]

I added four FAQ entries today.

http://www.tnpi.biz/internet/mail/toaster/faq.shtml" target="_blank">http://www.tnpi.biz/internet/mail/toaster/faq.shtml

Is portupgrade -a safe?
Why does SpamAssassin take so long to check messages?
How do I set up per-user SpamAssassin preferences?
What needs to be in /etc/rc.conf?