I use bridge and it is easy to configure and works great most of the time. And absolutely, completely and totally horribly a small fraction of the time. Specif

I use bridge and it is easy to configure and works great most of the time. And absolutely, completely and totally horribly a small fraction of the time. Specifically, the bridge + Proton Mail combo reuses UUID. It is a known bug, which proton does not see as a big deal (we will fix it; someday; when we care enough). But what this means is that some messages may be mis-tagged, mis-labeled or mis-deleted between your mail client and the server. I hit it when I was reorganizing my folder structure, freely adding and deleting subfolders from Thunderbird to create the structure I like. Then, the changes stopped reflecting and a fraction of my messages appeared gone. I finally was able to undo it through the web client, but the experience left me deeply suspicious of anything except the simplest operations with local client. And encouraged more diligence with making local backup copies of my emails.