Ummm. In this case SmarterMail IS the mail client. Using the POP Retreival function that SmarterMail has to pull mail from a different POP account on a different mail system and deposit said messages into a specific mailbox on the Smartermail server.
The settings for the POP Retrieval time interval were under the POP Menu. I was looking for a specific POP Retrieval menu and was not finding it.
System Admin: Settings>>Protocol Settings>>Pop>>Pop Retrieval Interval>>Save