Protonmail
How do I migrate all emails from a email address into a specific folder.
Proton's filters are only run on newly received mails. You can use a client like Thunderbird or Outlook (via the Proton Bridge) that support filters that you can run on existing mails in your mailbox.
- How do I get my filters to run? : ProtonMail
- Add ability to run newly created filters against existing mail – Customer Feedback for Proton
- How to apply filter on already received emails? : ProtonMail