You can delete messages from a folder and move them to the trash. On the screen that lists messages, tap 
(Options) > [Delete], tap the checkbox to set a checkmark for the messages you want to delete, and then tap [Delete].
Messages that are accidentally deleted (moved to the trash) can be placed back into the Inbox or any other folder you select. Tap 
(Trash) > 
(Folders) and tap the checkbox of the message you want to move back, then tap [Move to [Inbox]] or [Move To].
Deleting emails from the trash
Tap (Options) > [Delete] on the screen that lists messages in the trash, tap the checkbox to set a checkmark for the message you want to delete, and then tap [Delete].
- You cannot restore emails that you have deleted from the trash.
- Depending on the email service you are using and the settings of your email account, deleting email messages on the PS Vita system may also delete them from the server.