I have received a subpoena addressed to a particular person. the person being subpoenaed got mad.?:
Why did you accept it in his stance? This isn't like a prize or a package from UPS that you can accept on someone's behalf. 
A supoena is a very important document sent by the courts, with the specific destination being to the person in question, not the person's dog or girlfriend or stupid coworkers. By accepting the stupid slip, you made it easy for ther server to nonchalantly say he "served" the document to the destination person, when in fact it was not.  To make an analogical comparison, would you have accepted someone's document if it were a lawsuit. Are you that nosy for someone? 

The fact is, that person can deny that he was served because you have no real authority to give subpeonas. He can say you burned it and he never got it (no signatures that he himself received anything), and you could be in deep water for that court offense, including possible jail. So, yes he has a decent right to be pissed at you. I would.