How to configure Protector to forward Identity of SMTP incoming mail

Hi Just a quick question: I need to configure the Secpoint to forward the Identity of the SMTP incoming mail.
Right now the Mail Server behind the firewall receives the Mail with the IP of the Firewall, so it does not recognise the sender SMTP server. 
Can you help me? 
Thank you in advance 

Reply
From what I can see, the the Protector is configured to receive and filter the mail for a number of domains, and it's configured as the MX record of those domains:
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For this reason, the Protector is acting as a mail transfer agent (MTA), and, after the anti spam/ anti virus check, it will forward the mail to the mail server in the LAN, which will see the mail coming from the Protector.
However, if you go to /rep_message_listing.php and click inside [ ] to see the mail details, you will see the originating smtp server.