Import emails to your secure ProtonMail inbox or make offline backups with the...
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Migrate and secure your important email conversations

Keep your personal email history private and secure by migrating it to ProtonMail using the Import-Export app.
• Bring your mailbox:

Your email is a record of your personal conversations and important milestones.
Bring those memories with you when you upgrade to a secure and private inbox with ProtonMail.
• Keep only whats important:

Old newsletters, random receipts, special offers - your inbox can fill up fast.
The Import-Export app lets you easily select which messages you want to import.
• Secure conversation history:

When you import your emails, the Import-Export app automatically encrypts them before they leave your device.
That way only you can access your personal messages.

Источник
Репозиторий: flathub

FlatPak: ProtonMail Import-Export app [Productivity]