Comment by polaris64

I've suffered from exactly the same issues with Protonmail Bridge, and just this last weekend I decided (reluctantly) to move to a more standard mail provider (I chose Mailbox.org).

Aside from the UID issue discussed I also had problems with Bridge not supporting my particular use-cases. I created my own fork (see https://github.com/polaris64/proton-bridge) to work around some limitations and to add features, but maintaining this was too much work, especially as paying for a mail provider was supposed to reduce maintenance burden. I have had a pull request open since the 23rd of June to merge these to the upstream version, but so far I haven't received any comments from the Proton team.

I like ProtonMail, I just wish Bridge was more standards-compliant.