[mcny]

On the flip side, I would like to see a free of cost email provider offer JMAP as well. It could be a limited version in the sense that something like the free version only has limited storage or something but it offers the full JMAP experience ^TM or at least that's my expectation to use JMAP.

How come there are no free of cost email providers that support JMAP?

[Mailtemi]

You can use https://stalw.art. Compared to other email stacks, it is very easy to set up. Its support is on par with Fastmail. I develop a JMAP email app (https://mailtemi.com) and have run equal tests against stalw.art locally as well as Fastmail.

[amaccuish]

But there’s no calendar or contacts support with stalwart right?

[Mailtemi]

Neither Fastmail's JMAP for third-party apps nor Stalw.art supports Contacts/Calendars yet. Fastmail said that it will be enabled once it passes IETF standardization. Stalw.art also mentioned they will add support after the standard is finalized.