Prevent email accounts from getting certain emails?

oah

Active Member
Jan 23, 2018
33
4
8
Iraq
cPanel Access Level
Website Owner
Hi
i am wondering on how to prevent the email accounts on my domain (cpanel account) from sending or receiving emails from a specific domain, how to do that in cpanel? (I have no WHM access).
To be more specific, when the client sends an email to the blocked-domain say "x" the email should appear as if it is sent just fine despite the fact it is not sent at all.
Any ideas, suggestions are highly welcomed.

P.S.: The WHM is configured to use a remote SMTP service, I am not sure if that is related to or not. Just to make u aware.

Thx.