SOLVED SMTP restrictions option false after server restart

Hello, I have noticed a little inconsistency when playing with "SMTP restrictions" option. When I disable the option in WHM -> security center and restart the server, the option in WHM shows that it is still disabled, but actually, the option has been re-enabled in the background. I have to enable/disable it again to take effect.

Is there a way to make this change permanent, regardless of server restart?

I didn't find any documentation on what this option actually does, and are there any config files associated with it. I'm running Centos7.4 / WHM 68.0.19.

Any help would be appreciated, Thx.

 

Hi, I don't use firewalld, I use iptables instead, so the command's output was:

Code:

Unit firewalld.service could not be found.

but I did some further iptables configuration checks and figured out where the problem was.
As it happens, I had an old iptables configuration loaded automatically at boot time, and in that configuration, the SMTP restrictions were enabled.
So every time I rebooted the system, the old configuration kicked in.

Sorry if I wasted your time, Thank you.