Blacklist intercepts each other's text messages. Does the other party know?

I don't know that blacklist interception is a phone or SMS filtering mechanism, which operates on the receiver's equipment. When the sender's number or short message content is added to the blocking list, the receiver's equipment will automatically filter these numbers or short messages from the blacklist so that they will not be displayed or notified to the receiver's users. This process is completely carried out on the receiver's device, and the sender doesn't know that his number or short message has been intercepted.