[ccmcarey]

It wasn't super obvious to me, but you have to use beta.fastmail.com for this to work.

Confused me for a moment as you can complete the first step of enabling this (changing to New Rules) using the stable client.

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Oh, no, it's even more confusing than that. You enable the labels beta function on the beta website, but then it applies even on the main website.

[pointillistic]

you are right, does this mean that labels will work on the main site?

[ccmcarey]

Yep, seems to have the same functionality.

I've submitted beta feedback indicating my concerns.