From that thread 9 months ago, who goes on to complain about not having post mortems sent to him via Twitter.

I've been using Fastmail since 2014 and can't remember a time I couldn't log in and access my email. I'm sure the service has gone down in the past 7 years, but I can't tell any difference from Fastmail's uptime vs Microsoft's for Outlook 365 and Google's for GMail.

I just read some emails before opening HN and seeing this, in fact. Their caching works well enough that I didn't even know they were down. Now it's showing that it can't connect to the server. Well done, Team Fastmail--that's pretty slick.