I use www.fastmail.fm (owned by Opera) and can't recommend them highly enough. For a family or small business it's great as you can have shared folders/address

I use www.fastmail.fm (owned by Opera) and can't recommend them highly enough. For a family or small business it's great as you can have shared folders/address books, use your own domain(s), and more. The web mail doesn't include tagging or inline conversations but otherwise it's pretty good with not too much wastage. Of course you also have IMAP/POP access if that's your flavour.