def send_onboarding_message(self, user_email: str) -> dict:
    """
    Sends the onboarding message to a user.

    :param user_email: The email of the user to be on-boarded.
    :type user_email: str
    :return: The response from the message request as a dict.
    :rtype: dict
    """
    user = self.get_user_by_email(email=user_email)["user"]["id"]
    response = self.bot_client.conversations_open(users=[user])
    if not response["ok"]:
        return response

    channel = response["channel"]["id"]
    message = self.messenger.get_welcome_block(channel=channel)
    return self._send_block_message(message=message)