The right-click menu places “Mark Unread” between “Trash” and “Mark As Spam” making the possibility of accidentally clicking on “Trash” or “Mark As Spam” high. Both actions are somewhat destructive.
Proposed Solution
Rearrange the menu pushing “Trash” and “Mark As Spam” to the bottom of the menu with a separator thus reducing the likelihood of an unpleasant user error.
Ahh this is a good idea! This has been implemented in Mailspring 1.18.0 - the thread context menu has been rearranged to reduce accidental destructive actions (#2620). “Trash” and “Mark as Spam” are now separated from other actions to minimize the chance of accidentally clicking them.