[CentOS] mail/access revisited

A while back, I posted a note asking if anyone had any ideas why the /etc/mail/access file was not being parsed or utilized in the efforts to stop spam and junk mail. I just looked over things again, and have still not found any reason why it still permits the TLD's I have listed to pass thru. I also thought perhaps there might be some "upper limit" to the number of entries sendmail could handle. What do the sendmail guru's think about that idea? I may reduce the number of entries from the current 275 +/- down to just the most offensive TLD's and see what happens. Short of that, are there any other thoughts ya'll might have as to why it still passes the stuff I want blocked?

Thanks..

Sam