Can we use an iRule to dispatch SMTP messages?

Thanks! All I really need to show is routing of the message based on the RCPT TO: field. We've advanced to the point where the customer wants a proof of concept and I'd like to persue this further. We can assume for the proof of concept that we will only have a handful of mail accounts to determine and no worries for advanced error handling. Will you clue me in on the basic rule structure? I'm afraid I'm getting pretty confused.