Comment on Thunderbird

I was a devout Thunderbird user on Windows, but the Mac build plain sucks. I have a lot of mail- my POP account has got to be over ten years old so I get a crazy amount of spam. Thunderbird can't deal with it very well. It's slow and locks up too much. However I don't feel like transitioning to or paying for a client.

Is there no such thing as a good email client for Mac OS X?