Unofficial ProtonMail Desktop App
There is this app. It is 3rd party but i can confirm it works well and has desktop notifications. https://github.com/vladimiry/ElectronMail
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
What email clients are you using with protonmail (except for thunderbird)?
2 projects | reddit.com/r/ProtonMail | 26 Nov 2021
[Question] Re: Inactivity and ElectronMail
1 project | reddit.com/r/ProtonMail | 26 Oct 2021
Does he bridge consume a noticeable amount of battery?
1 project | reddit.com/r/ProtonMail | 30 Sep 2021
Just started using Electronmail, any way to improve its notifications?
1 project | reddit.com/r/ProtonMail | 22 Sep 2021
ProtonMail Dedicated Desktop Client
1 project | reddit.com/r/ProtonMail | 21 Jul 2021