Spark Reviews

Stores your info on 3rd party servers

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From a hacker news commenter https://news.ycombinator.com/item?id=14282065

mikhailt 78 days ago [-]

Yes, they do. It's why I don't use them.
Source: https://sparkmailapp.com/privacy

Accounts are added to Spark through OAuth where possible. Where OAuth is not supported we keep your account username and password on our secure servers. We then use the authorization provided to download your emails to our virtual servers and push to your device. We use Amazon Web Services (AWS) infrastructure to store your data. Apart from the AWS' security policies we take a number of measures to ensure that your data is never read by anyone else. We ensure that all transmission is secured with HTTPS so that no one else can access your data. Your account credentials are stored on secure cloud-based servers using asymmetric encryption.

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If those guys make version for Windows, Linux, Android and web I'll gladly purchase their software. :)
The version for the macOS so far has been great.

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Great for across multiple devices such as using an iWatch, iPhone & MBP

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