CSF by default configuration will generate a lot of emails alerting you to the various executables on the server that are running. These are mostly email warnings about different versions of PHP. You can ‘whitelist’ these executables through the WHM GUI for CSF or through the command line.
CSF
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When using ConfigServer Firewall (CSF) you may encounter a large volume of email notifications warning of the virtual memory limit being exceeded. This may often happen in an event_mpm PHP-FPM environment. The tweak below allows you to adjust the value to a higher one.