Cpanel exim set up a mail relay for spam filtering

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http://serverfault.com – Okay here's the problem: I'm using cpanel. I am trying to set up spamtitan. If anyone has done this before than that should be enough information to answer the question, comically enough. Now for the longer explanation... I can have the MX record set to the spamtitan's ip. My spamtitan server is on cloud so it sends to the ip of the cloud server, spamtitan reads that it is okay and sends it back to my domain. This is where the problem persists. What next? Smarthost is what has been offered but I haven't seen this working: smart_route: driver = manualroute transport = remote_smtp route_lis (HowTos)