Filter out / exclude trashed emails from searches
I don't personally have a compelling reason to delete my emails permanently due to the amount of free space on my account, and due to the negatives outweighing the positives as far as I'm concerned. For example, that email I accidentally deleted a couple months ago without realizing, can now be recovered from the trash.
However, when using the search feature, all trashed emails are included in the results which can add a lot of noise. Therefore, I'd love an option to be able to exclude trashed emails from the results.
In terms of usability, it may be nice for it to be a toggle, so it persists across sessions (and also gets applies to non-advanced searches too). If not a persistent toggle, then a checkbox option when performing an advanced search (though in my case, the former suggestion would be highly preferred as I'll rarely ever want to search through my trash).