Are you wondering how the e-mail can be archived or how the iSeries is to e-mail the report?
Add a data queue to the output queue where your world writer reports land. Then write a program to receive data from the data queue. Inspect the spool file attributes. If it is one that needs to be delivered to a specific user run it through your PDF converter (native in recent release of i5/OS) and send to your user as an e-mail attachment.
Both Gumbo and BVS Tools sell reasonably priced utilities that greatly simplify this task.