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My Current Mail Server is setup per Below<br />
<br />
Router/Firewall &gt;&nbsp;Port 25 Forwarded &gt;&nbsp;Anti-Spam Server &gt;&nbsp;Port 25 Forwarded &gt;&nbsp;Mail Server<br />
<br />
what I want to do is add an ISA server or similar machine which can inspect where the origination IP request came from. Then if the Originating machine matches our list it forwards to another server rather than the Anti-Spam Server.<br />
<br />
IE.<br />
No Match<br />
Router/Firewall &gt;&nbsp;Port 25 Forwarded &gt;&nbsp;ISA Server &gt;&nbsp;Port 25 Forwarded &gt;&nbsp;Anti-Spam Server &gt;&nbsp;Port 25 Forwarded &gt;&nbsp;Mail Server<br />
Match<br />
Router/Firewall &gt;&nbsp;Port 25 Forwarded &gt;&nbsp;ISA Server &gt;&nbsp;Port 25 Forwarded &gt;&nbsp;Secondary Server
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My Current Mail Server is setup per Below

Router/Firewall > Port 25 Forwarded > Anti-Spam Server > Port 25 Forwarded > Mail Server

what I want to do is add an ISA server or similar machine which can inspect where the origination IP request came from. Then if the Originating machine matches our list it forwards to another server rather than the Anti-Spam Server.

IE.
No Match
Router/Firewall > Port 25 Forwarded > ISA Server > Port 25 Forwarded > Anti-Spam Server > Port 25 Forwarded > Mail Server
Match
Router/Firewall > Port 25 Forwarded > ISA Server > Port 25 Forwarded > Secondary Server

Policy Based Firewall Rules

Anti-virus software was originally developed to detect and remove computer viruses. However, with the proliferation of other kinds of malware, antivirus software started to provide protection from other computer threats. In particular, modern antivirus software can protect from malicious browser helper objects (BHOs), browser hijackers, ransomware, keyloggers, backdoors, rootkits, trojan horses, worms, malicious layered service providers (LSPs), dialers, fraud tools, adware and spyware. Some products also include protection from other computer threats, such as infected and malicious URLs, spam, scam and phishing attacks, online identity theft (privacy), online banking attacks, social engineering techniques, Advanced Persistent Threat (APT), botnets and DDoS attacks.

Anti-Virus Apps

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.