title: Routing Error No route matches [POST] when submitting
body: <p>I have created a form but I'm having issues submitting the form, it's not getting the right route, I'm sure this is a simple fix, I'm just not seeing it.</p>
  
  <p>Here are the relevant files:</p>
  
  <p><code>new.html.erb</code></p>
  
  <pre><code>&lt;%= content_for :title, "Orders &amp; Returns" %&gt;
  
  &lt;div class="title"&gt;
    &lt;h1&gt;Orders &amp;amp; Returns&lt;/h1&gt;
    &lt;p&gt;In order for us to initialise a return of any order, first we need some information.&lt;/p&gt;
  &lt;/div&gt;
  
  &lt;%= simple_form_for("/orders_and_returns/thank_you") do |f| %&gt;
    &lt;%= f.input :order_number,
                error: false,
                label: false,
                required: true,
                placeholder: "Order Number" %&gt;
  
    &lt;%= f.input :billing_name,
                error: false,
                label: false,
                required: true,
                placeholder: "Billing Name" %&gt;
  
    &lt;%= f.input :email,
                error: false,
                label: false,
                required: true,
                placeholder: "Email Address" %&gt;
  
    &lt;%= f.input :message,
                as: :text,
                error: false,
                label: false,
                required: true,
                placeholder: "Why do you wish to initialise a return?" %&gt;
  
    &lt;div class="hidden"&gt;
      &lt;%= f.input :nickname,
                  label: false,
                  required: false,
                  placeholder: "Captcha" %&gt;
    &lt;/div&gt;
  
    &lt;%= f.submit "Submit",
                 class: "button-border center-100" %&gt;
  &lt;% end %&gt;
  </code></pre>
  
  <p><code>thank_you.html.erb</code></p>
  
  <pre><code>&lt;% content_for :title, "Thank You" %&gt;
  
  &lt;div class="title"&gt;
    &lt;h3&gt;Thank you for your message!&lt;/h3&gt;
    &lt;p&gt;We shall get back to you soon.&lt;/p&gt;
  &lt;/div&gt;
  
  &lt;section class="text-center"&gt;
    &lt;%= link_to "Go back home", root_path %&gt;
  &lt;/section&gt;
  </code></pre>
  
  <p><code>order_and_returns_controller.rb</code></p>
  
  <pre><code>class OrdersAndReturnsController &lt; ApplicationController
    def new
    end
  
    def thank_you
      @order_name   =   params[:order_name]
      @billing_name =   params[:billing_name]
      @email        =   params[:email]
      @message      =   params[:message]
  
      OrdersAndReturnMailer.orders_and_returns(@order_number, @billing_name, @email, @message).deliver_now
    end
  end
  </code></pre>
  
  <p><code>orders_and_return_mailer.rb</code></p>
  
  <pre><code>class OrdersAndReturnMailer &lt; ApplicationMailer
  
    def orders_and_returns(order_number, billing_name, email, message)
      @order_number = order_number
      @billing_name = billing_name
      @email        = email
      @message      = message
  
      mail(
           from: email,
           to: ENV['order_email'],
           subject: "You have a new return query from #{email}"
           )
      end
    end
  
  end
  </code></pre>
  
  <p><code>routes.rb</code></p>
  
  <pre><code>get 'orders_and_returns/new'
  post 'orders_and_returns/thank_you'
  </code></pre>
  
  <p>Not sure what I'm missing here, any help would be appreciated.</p>