*WARNING* The option "WHM > Tweak Settings > Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak)"
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SMTP block will be given as default in CSF so when you enable in cPanel, it will be conflicted. So go to the mentioned path WHM > Tweak Settings > Restrict outgoing SMTP To Root, Exim, And Mailman (FKA SMTP Tweak) and change it to OFF
After that give csf -r command. It will not show the Warning.
To help resolve the warning message you're encountering with CSF (ConfigServer Security & Firewall), please provide the geometry dash specific warning message you are seeing. This will help in diagnosing the issue and suggesting an appropriate solution.
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