Lotus Notes and Domino Auto-Replication

As of today, our company is using Lotus Notes 7.0.1 in our client-end and Lotus Notes 6.5 in domino server. I want the easiest and possible ways to generate an auto replication and after replication. The concept is to display all the latest emails and automatically delete the old emails that are no longer needed. Can someone please help me with this? Thank you.
