(Mix - please don't let us start that argument again - please)
I assume its the one where I tell you by the time its reached your Inbox, you're wasting your time with anti-spam ?
Fair enough, I'll watch you suffer in silence, but I feel to compelled to point out to others that if they are facing anti-spam issues, then that's something they should point out to their mail provider (or change mail providers) because filtering is best done upstream.
By the time it reaches your Inbox its too late, the goal is to exterminate it before it uses disk space (server or your desktop) and before you have to waste bandwidth and processing cycles trying your own software.
That is all.