To delete mail from a space, you need 'Remove Mail' permission. See Space Permissions.

Only a space administrator can delete all email messages for the space simultaneously.

To delete mail from a space:

1. A list of email messages in the space is displayed in reverse chronological order.
2. Delete an individual email message by choosing the trash icon beside it.
3. If you are a space administrator, you can delete all email messages within a space at once by choosing Delete All.

 Space administrators can restore deleted email messages, provided they were deleted individually.

Note:  Email messages deleted using the 'Delete All' option cannot be restored.

To restore mail that has been deleted:

1. 

2. Choose Content Tools > Trash.
3. You will see a list of email messages and other content deleted from the space. Choose Restore beside the email message you want to restore.

If your space uses the Documentation theme:

1. 
2. Choose Trash in the left-hand panel.
3. You will see a list of email messages and other content deleted from the space. Choose Restore beside the email message you want to restore.