What does HackerNews think of Mailspring?
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
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I was hopeful that https://www.nylas.com/ would be the de-facto "adapter" placing a common API surface on top of the major providers and dragging them into a modern-API world. They even had an email client of their own as a proof of concept (forked by one of the original authors as https://github.com/Foundry376/Mailspring - and its reusable core https://github.com/Foundry376/Mailspring-Sync may be interesting to many here). But they've pivoted towards making their API only available behind B2B contracts and opaque pricing, and primarily used for corporate email monitoring and CRM use cases - perhaps because security and privacy considerations are nontrivial. I'm still rooting for them but it's a shadow of what it could have been.
I thought this was the source? https://github.com/Foundry376/Mailspring
Or are you referring to the cloud aspects of Mailspring, like read receipts etc?
I can definitely recommend Mailspring[0].
It has occasional quirks, but very stable.
I use Mailspring which is available for Windows, Mac, and Linux. I use the free version but they have subscription model with many features (which I don't necessarily need).
I use Mailspring (https://github.com/Foundry376/Mailspring). Neat features, sleek UI and also pretty fast.
I currently use ThuderBird but I'm very sad about the lack of some basic features (grouping email chains?).
I wish someone would make an open source replacement to Mailspring's sync engine. I'd switch to that as soon as available. I just don't like the thought of someone having hidden code touching my email.