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Is Nylas open source? The OP was looking for an open source alternative. It is not clear from you website whether Nylas is open source or not?

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Their clients are.

However, you would gonna need their sync-engine[0] on your own servers in order to avoid contacting Nylas servers. From what I understand, it's kind of a cloud API that makes some sense out of emailing protocols.

[0] https://github.com/nylas/sync-engine

This is not entirely true anymore: https://blog.nylas.com/nylas-mail-is-now-free-8350d6a1044d

Not the OP, but the Nylas mail client is open source.

https://github.com/nylas/nylas-mail

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