I have faced these kind of incidents many times because there are many people in my organisation with the same name as me.
The appropriate action for these kinds of accidental emails are
(1) Reply back to him politely by saying something like "I think this email was sent to me by mistake. Please let me know if it is really intended for me". He will realize and take preventive actions if it was an accident.
(2) Just ping him and get clarification about the mail like "Hey I am slightly confused with the email that you sent yesterday with the subject XXXXXX. What is that about?". If the email was a mistake, he will realize and take preventive actions in the future.
(3)In my organisation, 2 other people exist with my name. Quite often, I receive emails intended for others. At such times, I usually try to identify the right person and send it to them. Many times, I search in the directory for other recipients. If many of the recipients(CC'ed people also) belong to same group or department, I will go to that department and check the members of that department. If any body in the group has the same name as me, I will forward that mail to him, saying "I believe this email is intended for you. I received it by mistake".