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Configure FirewallD for Mail Server in Centos 7

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Configure FirewallD for Mail Server in Centos 7 |

A mail server (or email server) is a computer system that sends and receives email. In many cases, web servers and mail servers are combined in a single machine. However, large ISPs and public email services (such as Gmail and Hotmail) may use dedicated hardware for sending and receiving email. In order for a computer system to function as a mail server, it must include mail server software. This software allows the system administrator to create and manage email accounts for any domains hosted on the server

Configure FirewallD for Mail Server

Check if firewalld is installed:

If not installed, install firewalld:

Ensure that firewalld is running:

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List allowed services:

Check active zone:


Add required services: HTTPS, SMTP, IMAP, POP3, DAV, DHCP(May be required in a testing environment).

Reload firewalld

List allowed services and ports. Check for previously added additions firewalld list rules


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