I’d love to suggest a feature that would make email management in Proton Mail so much smoother: a "Mark as unread in X days" or "Mark as unread on [Date]" option (basically a classic Snooze / Zurückstellen feature, similar to Gmail).

The Use Case:
Right now, keeping track of emails that need a follow-up later is a bit clunky. My ideal workflow would look like this:

1. I receive an email that I don not need right now, but need to act on in a few days.
2. I select "Mark as unread in X days" (or pick a specific date) and send it to the Archive.
3. Once the set date arrives, the email automatically pops back up as unread in my inbox.

This simple tweak would make setting up a clean, reliable follow-up system inside Proton Mail completely seamless without needing third-party tools like Thunderbird via Proton Bridge.