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

Here's how to delete individual messages and conversations on your iPhone's Messages app, with steps to set up an auto-delete ...

Now, for those who prefer to keep their message history down to a minimum, you can also set up automatic deletion of older messages. This feature is helpful if you're running low on device storage and ...

This setting will automatically remove older messages, keeping your conversations manageable. Note: Deleting messages from your Mac does not delete them from other Apple devices unless you have ...