Seeing issues resolving domains that use their nameservers (including my own, for email, so this is Very Bad Not Good).
Their status page shows all green, only info I can find on the web is someone else (https://twitter.com/kapi/status/1446361828477440005) nearly an hour ago asking if their DNS was down.
Now, the status page is showing https://www.fastmailstatus.com/services/general/2021-10-08, some dns issues.
"Some users might be experiencing DNS resolution issue on their domains and email delays. We are currently investigating."