Outlook Auto Delete Email

I manage my work email inbox using a simple set of rules:

• If an item requires my attention, I leave it in the inbox, flagging the ones I need to handle first
• If I need to retain an email for a long time, I move it to one of a dozen, topic-named folders
• If I might need an email in the short-term, I move it to a short-term "30-Day" folder
• If I don't need an email retained at all, I hit the delete key

To  automatically clean up my short-term emails, I've set the retention policy for the "30-Day" folder (Right-click "30-Day" ... Properties ... Policy tab), changing the "Folder Policy" to "1 Month Delete (30 days)".  The system takes care of the cleaning from there.

https://support.office.com/en-us/article/Automatically-move-or-delete-older-items-with-AutoArchive-e5ce650b-d129-49c3-898f-9cd517d79f8e