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We are going to be hosting our own email server in house. We don't have anymore public IP Addresses available so we are thinking about Pointing the MX record at the firewalls Public IP Address and then forward all smtp traffic to the email server. Is this the proper way to handle this or should forwarding be handled by the Router? 
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We are going to be hosting our own email server in house. We don't have anymore public IP Addresses available so we are thinking about Pointing the MX record at the firewalls Public IP Address and then forward all smtp traffic to the email server. Is this the proper way to handle this or should forwarding be handled by the Router? 

Forwarding SMTP through Sonicwall Soho3 Firewall

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.