I use Mail.app for most of my email, but I also keep gmail around as a nice web view, and some email just goes there.
Mail.app’s native spam filtering doesn’t seem to work well for me, so I have to jump up to use Spam Sieve, which does a decent job (considering I am getting many thousands of spam emails a day).
Gmail seems to do an ok job, but not as well as I hoped. I like the feeling when I click on a button called “Report Spam” versus “Send to Junk”. The name makes me feel like I can actually help. I hope that Google is watching and not just training its filters, but uses this for more.
For example, I would like to think that if lots of people were marking the same spam email as spam, that it would get taken out of my inbox automatically. Even if the mail first came through the filters, and 2 hours later gmail could work out it was spam, I would be more than happy for it to do this deed.
I have no clue if that happens, but it doesn’t feel like it.
But, then that system would be gamed by the spammer too. Ah, the arms race.