nabbisenI installed Protonmail Import-Export app on Arch Linux:
Then, I migrated emails to a newer account with the app. Here are some screenshots about it.
Start view
There is no account. What to do first is add an account.
Add an account
Click "Add account" at top-right corner. Verification will be required.
Succeessful:
Export / Import menus
Now ready for exporting/importing emails in Protonmail.
Export mails
With an older account, I exported emails as .mbox. Well, .eml is also supported.
Import mails
With a newer account, I imported them. I chose "Import local files":
Besides, if you have multiple accounts both of whose subscriptions are greater than free, you can directly "Import from account".
I selected .mbox files exported beforehand:
Thus, I recreated my account and succeeded in migrating emails.
