There are several ways to clean up your mailbox, including Categorizing, Moving and Purging your emails.
Categorizing: Several methods for categorizing email messages are provided. You can use these along with the Search feature to quickly locate and retrieve messages. Methods include:
Filters. In Preferences>Mail>Filters, you can create rules for classifying inbound mail according to items in the subject line, sender, recipient, or other characteristics.
Folders. You can create folders to organize your messages and you can move mail from one folder to another. For example, taking a mail out of a "To Do" folder and moving it to a "Done" folder.
Tags. You can use tags as labels on email messages and then use the Search feature to show all mail with a certain tag.
Conversations. You can have messages grouped by conversation. This built-in feature automatically groups all sent and received email messages with the same subject into a single conversation.
Moving: You can transfer email messages or entire conversations from one folder to anothe by two methodsr:
Drag and drop the item over the desired folder in the left-hand pane.
- Select the items, right-click, and select Move. In the Move Message box, select a destination folder, and click OK.
Purging: To delete messages from Trash, right-click on the Trash folder and select Empty Trash. All messages are deleted. If Recover Deleted Items displays when you right-click the Trash folder, you have the ability to recover items you deleted from Trash. Items deleted from Trash can be recovered within 30 days of deleting them from the Trash. After 30 days, the items are permanently deleted.