Email newsletter hosted service recommendation please (UK)

Or, back to hosted services, I started a couple of years back and have so far successfully managed to send 7 million+ emailed newsletters and bulletins out with hardly any problems. Manage my own data, .html loads, sends, etc., but with automated unsubscribe, spam management issues, ISP broadcast blacklist avoidance and all the rest of that nasty business.

They're nice people too, and we're talking hundreds rather than thousands. Might be worth checking out at least on http://www.circdata.com/dynamail.htm.