Reject sender silently?

[Markus E.]

Hi!
Is it possible to silently reject messages from a specific sender or 
domain in Postfix?

Somthing like:

us...@domain.tld  OK
us...@domain.tld  REJECT
us...@domain.tld  REJECT:nolog

...accepting messages from user1, rejecting and logging user2, and 
rejecting user3 without logging.

/me