this post was submitted on 01 Jul 2025
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Yeah, anyone looking to try Protonmail should be aware of how lock-in it can be if you're on the free account. Maybe things have changed since, but I couldn't set up email forwarding or bring my own client, and only noticed it when I was about to change provider.
It's like TutaMail (formerly Tutanota) – their security is such that it does not allow access by third-party clients. However, there are Thunderbird extensions that allow you to open a kind of web page in Thunderbird.
Paying customers can install a protocol bridge between Proton and regular mail client. This does break the security of local storage as TB doesn’t supply any.