Bouncing (almost) any email doesn't solve the problem, it just causes extra and mostly unnecessary traffic. Don't forget if the mail address is bogus you'll just end up bouncing the message between servers until it's finally dropped. One form of spam attack is to 'bounce' messages so they end up in a particular mailbox. You can achieve a much better result by rejecting unknown recipients.
Spamassassin determines if the message is spam and uses that to train it's filters, depending on the spam kill/tag percentages you should see very little spam in your inbox.
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Regards
Bill
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