So what am I doing wrong guys and gals?

My goal is to have all spam tagged by spam assassin deleted by my filter. So far, spam tagged by spam assassin arrives in the spam box and lives there until I delete it (about 2,000 messages/day).

I've set up spam assassin to the default setting of 5, no blacklist, no whitelist. It's doing the standard re-write of the subject line.

I've turned on the spam box in cpanel as well. Was this a bad idea since I just want the stuff be be discarded and don't have the time to read 2K of spam/day?

I've created an email filter which I thought would discard all spam rather than sending it to the spam box. The email filter is the "SpamAssassin Spam Header begins with Yes" and is  set it to Discard. If I paste the headers of a message caught by spam assassin in the test box, it says it'll go to dev/null (yes!).

However, there are still about 2k spams/day accumulating in the Spam box when I check with Horde. Can anyone tell me what I'm missing?

I've also set up a filter to get rid of the annoying Symantec auto-responses to myDoom emails that have spoofed our domain:
$header_subject: contains "Symantec Email Proxy"  and it's set to Discard. However, I still get about 40 emails with this subject line daily. Pasting in the header into the test box says the message should go to dev/null but it doesn't.

Any ideas why my filters won't discard this stuff?

thanks, thanks and thanks!

I just tried that (for a 45 minute period), and unfortunately the spam went to the inbox instead of being discarded

These are lunarpages mail accounts, not forwarded mail from another domain.

I did try disabling the SpamBox, but the spam arrived in my inbox when I did this (flagged as spam, thanks to spam assassin).

The filter is set to $h_X-Spam-Status: begins "Yes" with discard as the action.
Testing the filter using the test box does say that my sample spam would indeed go to dev/null.