Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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We did try the beta app, a few times. Generally we notice it on the other end; the recipient (especially one external to Proton) gets a truncatesd message or rarely, an empty one. I am 90% certain it has to do with the way Proton saves drafts before sending; I'd bet that it is not verifying the displayed version (user's version) against the last draft.
Very strange. I've used Proton roughly as long as you have, and have never had any of these issues with the Android client. I send emails from my phone all the time, even important ones.
Regardless, Proton acknowledges the issue:
Not exactly a stellar reply, given that their business revolves around their email offering.
That sounds like a good deduction