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If a client receives a damaged packet then it will know that after comparing the packet’s checksum to the one in the header.
But can a sender know when a packet has reached the client in a damaged form?
First of all, it seems you are making a confusion.
CSMA/CDis for detecting when somebody else is using the link so that a collision doesn’t happen. It’s its only purpose.Second, ethernet senders cannot find out if the frame they sent arrives malformed. There is no acknowledgement. The upper-layer protocols must take precautions.