The ruling on sending blessings upon the Prophet (peace and blessings be upon him) during the sermon, and saying "Ameen" to the preacher's supplication

Question:
This brother Muhammad says: When the preacher in the Friday prayer sends blessings upon the Prophet (peace and blessings be upon him) or makes a supplication at the end of his sermon, am I allowed to say "Ameen" and send blessings upon the Prophet (peace and blessings be upon him)?

Answer:
Yes, you may do so, and move your lips accordingly. You should hear yourself when saying "Ameen" to the supplication, and when sending blessings upon the Prophet (peace and blessings be upon him), or mentioning him with blessings and peace upon him. Yes.