Sending All Mails [SMTP / PHP Function] Thruogh Another Server

You are wanting to use a smart host router to route all emails through the smart host rather than directly from your machine. Please note that, for exim, your IP is still going to appear in the sender header as one of the IPs that handled the routing regardless, although it won't be the final IP routing the message.

Here is a prior post where I discussed using a smart host router:

http://forums.cpanel.net/f43/relay-all-mail-through-spam-filtering-appliance-155390.html#post766872

 

Yahoo and hotmail do not do deep scanning, so the final IP that sends the message would be what they should be considering for determining if an email will pass into an inbox on their services.

I don't get what "other side should be cpanel server, right ?!" means exactly. Are you asking if the smart host server that will be filtering the emails should also have cPanel on it? It doesn't have to have cPanel on it, it just needs to be capable of receiving and then sending out the emails. If the second machine were also cPanel, you'd have to make that machine a relay for the other machine.

So the smart host machine (if it has cPanel) would need to have the IP for the initial machine into a file you create called /etc/alwaysrelay and then restart exim on that smart host machine. This should be all that is needed to allow the smart host machine to relay the emails from the initial machine.