blackhole under tweak Security

[webits]

I went to Tweark Security settings on the WHM (ROOT) and activated the Blackhole feature so people who send e-mail to users lalalla@whatever.com and doesn't exist will fail but when i do a test im still receiving the e-mails..
I'm using Cpanel Release.

[chirpy]

I presume you mean Tweak Settings. That option is only for new accounts. You'll have to change existing accounts individually.