Send batch message Mailgun

def send_emails
    mg_client = Mailgun::Client.new ENV["MAILGUN_API_KEY"]
    mb_obj    = Mailgun::BatchMessage.new(mg_client, ENV["MAILGUN_DOMAIN"])

    mb_obj.set_from_address(ENV["MAILGUN_EMAIL"],
      {"first"=>"Firs tname",
      "last" => "Last name"
      }
    );
    mb_obj.set_subject("New message!");

    mb_obj.set_text_body("Hello %recipient.first%,
                         This is the text body of the message
                         using recipient variables!
                         If you needed to reference the account-id
                         recipient variable, you could do it like
                         this: %recipient.account_id%.");


    find_users.each do |recipient|
      mb_obj.add_recipient(:to, recipient[:email], recipient);
    end

    message_ids = mb_obj.finalize
end