More spam stats

As I was watching the mail logs this morning, I realized that a substantial portion of the spam I receive gets dumped by the MTA before it even has a chance to reach my spam filters. Now, I’m not sure if this can really rightly be called spam, but perhaps attempted spam. So, I added these numbers to my spam stats, and it added at least another 20% to the figure. Seems that about 63% of all the email that my mail server receives is rejected. Most of this (apparently about 40%) is dropped specifically because the content identifies it as spam. The remainder is sent to bogus or no-longer-valid email addresses, or is sent from faked addresses. And, even after that, I still get a significant number of junk messages in my inbox every time I check my mail. When will this nonsense end?