I quit ProtonMail / ProtonVPN after trying over and over and over again to import mail through their IMAP bridge. They won't provide an open API for interactin

I quit ProtonMail / ProtonVPN after trying over and over and over again to import mail through their IMAP bridge. They won't provide an open API for interacting with their mail services so someone can write a better bridge, and their bridge is very slow, disconnects repeatedly, and basically makes any migrations impossible. If you're willing to start over with an empty mailbox, maybe ProtonMail is for you. I eventually gave up trying to move my mail account in (many tries, with Thunderbird in chunks, with Lamiral's awesome imapsync tool, you name it), and let them keep the money I paid for a year of ProtonMail Visionary. I ended up using StartMail from the StartPage people. It's not perfect, but I was actually able to migrate to it and use it effectively.