We, FastMail, are not affected by this. We do not proxy TLS connections via any third party. We use CloudFlare for DNS distribution only, which is not part of this issue.

The least surprising message of the day. Thank you.

My Fastmail-money is well spent.

And this is why making that yearly payment for your service actually makes me happy. :)

More detailed information for others:

https://www.cloudflare.com/case-studies/fastmail/

Thanks for posting here, I was explicitly looking to see if anyone mentioned Fastmail after I saw it on that Github list. You might want to post something on your site if you haven't already, kinda like 1password did.

Stack Overflow is not directly affected (see http://meta.stackexchange.com/a/291482/151385). They stopped using CloudFlare before this issue was introduced.