Hi Ray...
Thanks agane for the reply,
Relay mean to relay mail to my local email server that will be running behind the gateway box. and to relay the email from the email server to the internet as a smart host.
Well ... if you have an SMTP server on a LAN ("local") host, running an SMTP relay on the firewall/router is probably unnecessary. What you can do (this is what I do here) is DNAT (port forward) traffic coming to port 25 on the router's external interface to port 25 on the existing SMTP server. Then you can run your greylist and virus checking on that server. This approach minimizes the amount of stuff you have running on the firewall/router, always a good idea from a security standpoint.
As to outgoing SMTP traffic, there is no need to "relay" it from the LAN SMTP server. Ordinary NATing will handle outgoing SMTP traffic from that server (unless you have unusual requirments imposed by your ISP ... but if you do, you won't get intelligent advice about how to cope with them unless you mention them).
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