Thunderbird is doing crappy job filtering my spam (please recommend replacement)

I've been trying to train this POS spam filter for months and have manually flagged every single spam it hasn't caught. The last couple weeks it has missed catching about half of the incoming inbox spam and is allowing nearly every spam with viagra in the subject line. It's not even filtering out all of the spam clearly labeled "Sexually Explicit" (catching some yet not others from the obvious same sender), it's allowing porn spam with obvious words (properly spelled, and labeled as junk in previous similar mail), ie: blowjobs, tranny, dildo, etc. In another e-mail account folder it's worse, only one spam was flagged out of over 100

I had heard many good things about Thunderbird's spam filter, I can't believe my results. It's like maybe 1/4 of the filters set actually work sometimes and none of them work all the time.

I need something that will let me use multiple POP/SMTP accounts) (a dozen or so) and filter spam decently. I have Outlook Express and Thunderbird both on this PC, but am not really attached to either, so I'm open to checking out any recommendtion that requires a change of e-mail client (I'm not looking for an office suite, just e-mail & spam protection). I'm trying to make this the last switch so I want to feel confident whatever I switch to next is one that will work.

Please recommend what you are currently using on your webmaster e-mail account(s) with good results. Thanks!