BT Internet
My main email address is a BT Internet one. They have just upgraded their anti-spam filters, and they do a great job - it's really good to get my inbox clear for once, but beware: the filters aren't perfect and you need to check the Builk Mail file. I have just been through a week's worth (2650 mails) to identify the five non-spam ones that I needed to see. The system learns when you click the Not Spam button, so over time all of your regular correspondents should be OK.