Someone has created a transport rule in Exchange that rejects messages sent to that no reply email. If you dont want that, then disable or remove that rule.
Email From no-reply

Good afternoon friends, I am writing to you to see if I can find a solution to this, i create a no-reply email, which its only function is to provide information to customers, and also notify them that, Please do not reply, this email box is not monitored. the question is that the message comes out but with a whole body as if it were an alert, I do not know if I am doing something wrong or I have a configuration to disable, I just want the aforementioned message to appear and not, I just want the aforementioned message to appear and not all this alert of why the reason for the message, I do not know if it is normal, any information will be grateful.