app/views/incoming_messages/create.html.erb
<div class="container">
<div class="column-content">
<% if @message.persisted? -%>
<p>Your message has been sent successfully! You'll receive a reply shortly. Thanks very much for your time.</p>
<% else -%>
<p>We're sorry, there was a problem submitting your message.</p>
<%= render '/shared/error_messages', target: @message %>
<% end -%>
</div>
</div>