I can access Fastmail now, but the web interface did stall about 40 minutes ago when I was sending an email.
Update: seems to be back up for my team
Mine is working fine, so it must not affect everyone, or is intermittent?
The message at https://fastmailstatus.com/ is that some users are unable to access Fastmail services. Wonder if that's geographic, the digital gods rolling some dice, or something else.
I did just receive a soft bounce on an outbound mail I sent that should have been a valid address. Perhaps they are having email issues, not web interface issues.
My "status pages" are manually updated. It's a challenge to get updates out and troubleshoot, especially depending on org size and the underlying event.
It is now. I've found that it sometimes takes a little while for an outage or interruption to register.