Couple of months ago I was asked to provide a non-Gmail-hosted email address for reliable confirmation (while booking a flight with China Airlines). After a bit of investigation I made the decision to jump onto FastMail’s cheapest personal plan.
Guess what, had to give up after 10 minutes or so—their sign-up form kept reporting server error!
Rationally I do realize that whatever it was it’s unlikely to affect their existing customers… Still, anyone can comment on FastMail’s actual uptime?