Is sending greetings of peace to the Prophet (peace and blessings be upon him) with pilgrims permissible in Islamic law?

Entrusting someone with conveying salutations to the Prophet, peace be upon him, when visiting Medina is impermissible and an innovation (bid'ah). This is because angels convey his salutations to the Prophet, peace be upon him, wherever he may be. The Messenger of Allah, peace be upon him, said: "Do not turn your houses into graves, and do not turn my grave into a place of festivity. Send blessings upon me, for your blessings reach me wherever you are."