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One reason could be that they need one if there are unique differentiators on the roadmap that cannot be added into regular clients. I dont know if this is the case.

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That's even more reason for fast mail to actually invest and coordinate with clients, especially with JMAP integration.

This is from August 2019

https://www.fastmail.com/blog/jmap-new-email-open-standard/

This announcement is a slap in our faces.

This is basically where I'm at. I love Fastmail, but going to the effort of trying to get JMAP standardized and then investing development effort to NOT put it in Thunderbird feels like there's no real intent to make email better for everyone, which is disappointing.

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