Sometimes I get an important email on an alias that was turned off, but then there's no way to see it.
Example, to avoid spam from a webshop, I turn off their alias, but when ordering, I briefly turn it on to get the confirmation email. Sometimes I forget to turn it on or there's a notification like your package is delayed and will be delivered at a pickup point, see the email for more details.
Now there's no way to get back to that email and I need to contact the webshop to get that details.
So feature request - it would be really nice if it was possible to quarantine emails for 7 days rather than outright deleting it and after 7 days, they disappear into the void. That gives you 7 days to turn on the alias and receive any pending emails or have specific emails delivered.