I must admit that I use Gmail as my mail interface, mainly for its archive and search capabilities. ?One problem with Gmail is that I often don't notice when I'm sending formatted html rather than plain text. But my mail actually goes to a linux machine and through a challenge/response spam filter that I wrote myself, then a copy is archived locally in addition to being forwarded to Gmail. On the linux machine I use mutt for reading mail. Apparently I'm about the last person on campus who still runs a non-dedicated mail server. The whole campus is moving to Gmail in the near future. Don't know what that means for my spam filter.