def check_send_private_message(sender: UserProfile, client: Client, receiving_user: UserProfile, body: str) -> int:
    addressee = Addressee.for_user_profile(receiving_user)
    message = check_message(sender, client, addressee, body)
    return do_send_messages([message])[0]
def check_send_private_message(sender: UserProfile, client: Client, receiving_user: UserProfile, body: str) -> int:
    addressee = Addressee.for_user_profile(receiving_user)
    message = check_message(sender, client, addressee, body)
    return do_send_messages([message])[0]