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1. Overview In this article, we will configure Postfix on CentOS 7 as a Mail Gateway for internal MS Exchange 2013 Server or any other back-end E-mail server. This systems provides several advantages such as blocking unwanted traffic, virus-scanning ,spam prevention, and reduce load on the internal back-end mail server. 2. Prerequisites In this article, it is presumed that: a. You have an public domain and have access to manage the DNS record for that domain name. b. You have a public IP address from an ISP assigned to your Cisco edge router. 3. System Architecture Diagram The following diagram is the scenarios for this configuration. There is one Cisco router facing with the internet. Postfix E-Mail Gateway staying behind the Cisco router. All incoming E-mails from the internet to the internal MS Exchange 2013 server must go through Postfix Mail Gateway first to scan for virus and spam E-mails. Likewise, Any E-mails from internal MS Exchange 2013 server going