[exim] response codes

Hello,
I have Exim working as a relay server, and a client application sends
emails through Exim.

Will Exim always accept incoming emails (consider ACLs are passed),
even though the destination server rejects the message?

I need the client to know when a message is rejected, I am currently
analyzing the bounce messages that arrive at the return-path, but that
has a delay I'd like to avoid.

Thank you.
DIego.