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NAT To SMTP Host

When i configure a NAT rule as follows
   Source: Any -> External_Interface__ / SMTP
   Change To:    None   DMZ_Host

Connections work perfectly, but the computer hosting the SMTP server behin my Astaro Firewall show all the connections coming from the IP address of the firewall, and not the actual ip address of the server sending the mail from the internet.  Is there any way to configure NAT so the source address shows the internet IP and not the firewalls IP?


  


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