You can swipe to delete messages in the iPhone's Mail app, but you'll need to enable this option in Settings.

Trash emails faster from the Mail app or the Gmail app This article explains how to set up your iPhone so that you can swipe to delete Gmail messages in the Mail or Gmail app. How to Enable Swipe to ...

With iOS 17, Apple brought some headline features to iPhones, like StandBy Mode and NameDrop, but Apple also introduced some smaller quality-of-life improvements that are well worth familiarizing ...