@65801207-the-protonmail-team Please re-open this idea for votes.

The Pushy team answered some questions for me, here are some specifics:

1. Encryption for Push notifications? Pushy Pro plan uses plaintext MQTT to deliver notifications downstream to devices. Their Enterprise plan however is fully TLS encrypted in all communications to and from Pushy, including your servers to theirs

2. Opensource? The Enterprise plan Some parts of their service is open source, others are not. Mostly their client SDKs are open source (but not the core Android SDK)

Use Pushy. It is a replacement for GCM but each app developer must manually embed Pushy in their apps. Pushy cannot itself be flashed onto a non-GMS phone to replace GCM.

Protonmail app development should support devices without GMS, you can embed the Pushy SDK in your app and it will work on these devices, instead of using GCM.

In the fight for privacy why not open a page on Diaspora* or Mastodon and Delete your Facebook and Google+ page.

Implementation or further work towards imap support for usage of clients such as K9 mail would be beneficial and would aid to the goal or removal of the dependence of google's push service.

im currently working on a temp. fix for getting notifications to work with nothing but fdroid resources and microg.

As far as I've understood, the only usage of GSF is for push notifications.
My phone does not have GSF installed, and the only annoyances are the message on start and the fact that e-mails are not synced in the background. I see that this "feature" is planned, but it has been planned for almost 2 years. I think someone should definitely start working on it....

These are the guys who are abusing our privacy, and why I came to ProtonMail to begin with. It is kind of silly for you to be offering a great privacy product, but then steer us to the greatest abusers of privacy in the world. I would not want to see any links to Facebook or Google at ProtonMail.

As a contributor to Protonmail, I find quite hilarious how dependent it is on Google and it's services. Why on earth would I want Google to keep a registry of my downloaded apps? Not to talk about other 'features' in the app, which apparently need Google to function?
Even though APKs can be found in the wild, it would be nice to get it from a centralized and trusted source like F-Droid. Makes upgrading easier too...

I second that. In my quest for perfect privacy (if that's even possible) I'm getting rid of every Google service. I've created a ProtonMail account, installed an alternative rom to my Android device without any of the Gapps, and just find out that even if I could download the APK and install it, I can't use the app because it depends on Google Play services.
That's a bit ironic....

Please get a GSF/Google Play Services free version and/or find a way to do push notifications without Google services. This is important for users who run custom Android ROMs without Google framework installed and it is also important for users who may use Google Play Store as they will not be relying on this for notifications. Proton Mail is a privacy focused service but this continued reliance on Google is both concerning and frustrating. Please consider raising the importance for the development of this "feature".

Yes, please. Protonmail needs a non-Google option or I need a new provider that clearly cares about privacy.

Kinda annoying to always see the "ProtonMail won't run without Google Play services" message when using the app. It still confuses me that an application aimed at privacy concerned users is dependant on the Google service framework. It's also irritating, that the application is only officially available in the Google Play Store! Why not offer it in F-Droid, or from the website like Threema does it?

This would be the best feature to me if implemented, as of now i dont have any way to receive notification for the inbox. Please remove the google depedency, please make the life easier for the people who want a little privacy in their life.

You have to stop to need to use five eyes Google services

Its is very important

I am even willing to pay extra to have this dependency removed!
PLEASE! This is ridiculous. I have a ton of apps that can send notifications without play services dependency. Even if you cannot remove this dependency for notifications (for whatever reason) - please add an option to stop using notifications. I will refresh the app manually if I want to - just remove the annoying pop-up message for now.

It is Verrryyy important to have more visibility in the world of FOSS, Open Souce community.

Support said 30.12.2017: "Thank you for your message. At this time, we utilize Google Play services to implement the push notifications. We will try to find other ways to support push notifications in the future."

I too use LineageOS without GAPPS. It is really important that the dependency for Google Play Services is removed. The app does work without only the push notifications are not working then.
I could live with some configurable polling (5, 15, 60, ... minutes)

Also i would really really like that you provide the .apk on your site. I have now downloaded it from some site but that is not a recommended way security wise.

This was planned a year ago. Any official word from the ProtonMail Team? If you want to convince the privacy conscious among us, you really need to get that app into F-Droid