Hadhrat Ibn Mas'ud radiAllahu anhu reported that the Prophet (sallallaahu alayhi wasallam) said: "Allah has Angels who travel about the earth; they [do and will] convey to me the peace greetings from my Ummah." [Authentically reported by Abu Dawud]
For more on this topic with the rebuttal of the typical doubts that are raised in the Indo-Pak subcontinent and other places please read the thread 'Dead Don't Hear'.
Please Guide that when anyone muslim read/sent darood pak upon Prohohet Muhammad (sallallaahu alayhi wasallam)that he listen it or Not in QABAR .Please guide.