The times being what they are, having my entire life stored in ProtonMail seems overly risky, even though I don't distrust ProtonMail's privacy features and policies. I mean, that's why I'm here, instead of GMail.

At the same time, there IS mail I would like to keep permanently, there is other mail that will obsolete itself (airline reservations), and still other mail that is good for a certain period but gets stale (topical research).

Each of these use cases can be handled by making a timer for auto-deletion available for each folder (including All Mail).

Ideally--

1) delete with local download and backup would be an option

2) delete via Trash (and its timer) and delete immedialty would both be options

3) Message me when deletion is done. Ideally message would include an Undo button (for those "OMG" moments).

Thank you!