help with spam assassin

I have recently installed spam assassin on a red hat 9 box, I followed these
instructions.

http://www.eschew.net/geek/spamassassin.php

In following the directions, spam assassin sends the mail to a designated
mailbox. Some of the mail that we are sending is getting sent to that
mailbox. When looking at why it is because it contains capital letters.
Where do I change that rule?
Is there a way that I can setup spam assassin to say all mails sent from a
particular address just ignore?
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