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To set individual "blackhole" setting for cPanel account [theme=x]:
Log in to cPanel
Click on "Mail" icon
Under the "Mail Manager Main Menu" click on "Default Address"
In "Default Address Maintenance" window, click on "Set Default Address"
Enter ":blackhole:" [without quotes] to discard all incoming unrouted mail.
NOTE: this must be done for each subdomain also.
To set default "blackhole" for all new accounts created in WHM:
Log in to WHM.
Under "Server Configuration" menu, click on "Tweak Settings".
In "Tweak Settings" window, under "Mail" section, ensure "Default catch-all/default address behavior for new accounts. fail will generally save the most CPU time." is set to "blackhole".
Scroll down and "save".
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