This site is hosted by Webfaction. I’ve run sites and applications with this company since 2008, and not only have I never had a problem with them, I can actually remember being impressed by their support. They’re proactive, for heaven’s sake!
Just now at Owlstone we’re moving host providers, to, you guessed it, Webfaction. I just used their API to create about 45 email addresses with forwarding in 5 minutes.