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Continue to ChatQuery : How to totally block inbound mail on cPanel / WHM? Is it possible to completely block inbound email on WHM / cPanel (without blocking sendmail / PHPMail from working)? If so, what config steps https://vmapp.org/query/119585/How-To-Totally-Block-Inbound-Mail-On-CPanel-WHM-Is-It-Possible-To-Completely-Block-Inbound-Email-On-WHM-CPanel-Without-Blocking-Sendmail-PHPMail-From-Working-If-So-What-Config-Steps/