my ebox is only working as proxy server, and don't have any users created, the mail server is in the internal network and is sending emails, but when you try to send an email from the outside to my internal mail server this one is been rejected by the ebox, my proxy server have two nic, one internal and other external with a public address, i had try by making a rediretion of the smtp port, to the internal address of the mail server.
y just need to pass the incoming mail to the internal mail server.
thanks