Let us take a closer look into how to disable ipv6 on Exim within a few simple steps with the assistance of our Server management services at Bobcares.

Exim

It is a message transfer agent (MTA) for Unix computers that are in link to the Internet. It is provided for free under the provisions of the GNU General Public License. There is a significant lot of freedom in mail routing and substantial facilities for checking the accessibility and management of the incoming mail.

Exim and IPv6

After disabling the IPV6 on Exim, no IPV6 activity occurs. AAAA records never look up, and any IPv6 address in the local interfaces, manualroute router data, and so on are disregarded. The ipliteral router refuses to handle IPv6 literal addresses when enabling the IP literals.

How to disable IPv6 in Exim

Examine whether IPv6 is in the activation and in the activation phase. IPv6 is will be automatically available if the tcp6 command is accessible.

[root@server ~]# netstat -tulpn | grep :25
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 23336/exim
tcp 0 0 0.0.0.0:2525 0.0.0.0:* LISTEN 23336/exim
tcp6 0 0 :::25 :::* LISTEN 23336/exim
tcp6 0 0 :::2525 :::* LISTEN 23336/exim

Open the Exim configuration file (/etc/exim/exim.conf) and add the argument if it is enabled. disable ipv6=true.

vi /etc/exim/exim.conf

After that add the following

disable_ipv6=true

The final step in the procedure is to restart Exim.

In Cpanel:

We can disable the IPV6 on Exim from the Cpanel. Follow the steps given below to disable ipv6:

1. Firstly, go to the Exim Configuration Manager (WHM > Service Configuration > Exim Configuration Manager).
2. After that, select Advanced Editor. And then, scroll to the “Add another configuration setting” button at the bottom of the page. Select disable ipv6 to disable it on Exim by clicking on the drop-down button and enter true in the box that appears as shown below:

Finally, save after completing the configurations. This marks the final step in deactivating iPV6 on the Exim using cPanel.

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Conclusion

To conclude, it is easy to disable and manage IPV6 by checking its accessibility and using the cPanel to complete the process on Exim.