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Tutanota did that: https://tutanota.com/blog/posts/open-source-email-fdroid/ https://tutanota.com/blog/posts/open-source-email-fdroid/

• dastx 6y ago
  This seems like it would be great to release as a library. That might increase adoption.
  • londons_explore 6y ago
    There is a massive technical benefit for all apps to use the same push server. If many different apps use their own push server, a connection has to be kept open to each and every server, and each open TCP connection costs quite a lot of battery (since the system has to wake up to receive keep alives)
    • bluGill 6y ago
      Agreed, but I trust my email provider to provide push. I would be willing to block all the rest.