ProtonMail mangles emails in a way that they are impossible to download as they were delivered to their servers, meaning MIME signatures cannot be verified, because the emails are altered.
Would you use a secure email service that breaks signature verification on received emails? There were a lot of smaller and bigger things along the years, but realizing I could not verify authenticity of signed emails for apparently no reason pushed me over threshold to leave them.
Old issue, affects also web UI not only bridge:
https://web.archive.org/web/20240221213617/https://github.co...
Would you use a secure email service that breaks signature verification on received emails? There were a lot of smaller and bigger things along the years, but realizing I could not verify authenticity of signed emails for apparently no reason pushed me over threshold to leave them.