Hi @Jabulani Motloung ,
I noticed your previous case, is it still the same issue? Does the user still have the ability to preview messages when configured as in the previous case?
As your setting above, it is blocking the sender, it has nothing to do with the recipient preview, and it can not achieve the effect you want.
It is not possible to remove or gray out the "review message", what kind of effect do you want to achieve, end users can receive notification of the quarantine message but cannot view the content of the quarantine message?