Rails 3.2, how to change: from the value in the mailbox instead of the default value (GMail)

I created a contact form and I am well receiving letters in my gApps inbox. However, the messages received show a default value: from the site value. I would like them to appear in the inbox from the email form. Therefore, when I click "reply", it takes the user's address as the address to which you want to send an email.

I tried this, but it does not work. Any idea why?

notifications_mailer.rb

class NotificationsMailer < ActionMailer::Base
  default to: "info@hikultura.com"

  def new_contact(message)
      @message = message
      mail(:subject => "[hiKultura.com] #{message.subject}",
        :from => message.email)
  end
end

ContactController

class ContactController < ApplicationController

  def new
    @message = Contactmessage.new
  end

  def create
    @message = Contactmessage.new(params[:contactmessage])

    if @message.valid?
      NotificationsMailer.new_contact(@message).deliver
      redirect_to(root_path, :notice => "Message was successfully sent.")
    else
      flash.now.alert = "Please fill all fields."
      render :new
    end
  end

end

UPDATE

I followed similar cases that I found in SO regarding: reply_to and GMail. But, still shows: to the email address when I hit the answer. What am I missing ???

notifications_mailer.rb

class NotificationsMailer < ActionMailer::Base

   default :from => 'no-reply@mydomain.com'

  def new_contact(message)
      @message = message
      mail(:reply_to => "mierda@hotmail.com",
      :subject => "[mydomain.com] #{message.subject}", 
      :to => "admin@mydomain.com"
      )
  end
end