Responding to blocked emails

Hi,I was wondering if there is a way in which a blocked email can be responded back automatically to the sender that this email did not make thru since it was blocked.

I am thinking of creating an agent that would check for this email address (or domain) under the user’s list of “Accept listing” and if it is not there send a auto-response. Not sure if there is a simpler way to do this from a server end.

Thanks,

Shankar.