What do you think?
Deleting emails on the iPhone
Perhaps this should be called Quickly delete an email on your iPhone!
Little tip I actually picked up in the Apple Store watching a video; when you are at the main email Inbox screen, quickly swipe left to right over the email in the list. A delete button appears so press it rather than having to open it first then use the Trash icon.
This also works in Notes and Messages.other page