discourse/app/views/user_notifications/mailing_list.html.erb

<div id="top"></div>
<table style='width: 100%; border: 20px solid #eee;' cellspacing='0' cellpadding='0'>
  <thead>
    <td style='padding: 10px 10px; background-color: #<%= @header_bgcolor %>;'>
      <a href='<%= Discourse.base_url %>' style='color: #<%= @anchor_color %>'>
        <% if logo_url.blank? %>
          <%= SiteSetting.title %>
        <% else %>
          <img src='<%= logo_url %>' style='max-height: 35px; min-height: 35px; height: 35px;' class='site-logo'></a>
        <% end %>
        <br />
        <div style='padding-top: 10px;'>
          <%= raw(t 'user_notifications.mailing_list.why', site_link: html_site_link(@anchor_color), date: @since_formatted) %>
        </div>
        <hr />
      </a>
    </td>
  </thead>
  <tr>
    <td>
      <h4 style="padding: 0 25px; margin: 10px 0;"><%= t('user_notifications.mailing_list.new_topics') %></h3>
      <ul>
        <% @new_topic_posts.keys.each do |topic| %>
          <li>
            <a href='<%= Discourse.base_url + topic.relative_url %>' style='color: #<%= @anchor_color %>'><%= raw format_topic_title(topic.title) %></a>
            <span><%= @new_topic_posts[topic].length %></span>
            <%= category_badge(topic.category, inline_style: true, absolute_url: true) %>
          </li>
        <% end %>
      </ul>
      <h4 style="padding: 0 25px; margin: 10px 0;"><%= t('user_notifications.mailing_list.topic_updates') %></h3>
      <ul>
        <% @existing_topic_posts.keys.each do |topic| %>
          <li>
            <a href='<%= Discourse.base_url + topic.relative_url %>' style='color: #<%= @anchor_color %>'><%= raw format_topic_title(topic.title) %></a>
            <span><%= @existing_topic_posts[topic].length %></span>
            <%= category_badge(topic.category, inline_style: true, absolute_url: true) %>
          </li>
        <% end %>
      </ul>
    </td>
  </tr>
</table>
<table style='width: 100%; background: #eee;' cellspacing='0' cellpadding='0'>
  <% @posts_by_topic.keys.each do |topic| %>
    <tr>
      <td>
        <h3 style='padding: 20px 20px 10px; margin: 0;'>
          <a href='<%= Discourse.base_url + topic.relative_url %>' style='color: #<%= @anchor_color %>'><%= raw format_topic_title(topic.title) %></a>
        </h3>
      </td>
    </tr>
    <tr>
      <td style='border-left: 20px solid #eee; border-right: 20px solid #eee; border-bottom: 10px solid #eee; padding: 10px 10px; background: #fff;'>
        <% @posts_by_topic[topic].each do |post| %>
          <div>
            <img style="float: left; width: 20px; padding-right: 5px;" src="<%= post.user.small_avatar_url %>" title="<%= post.user.username%>">
            <p style="font-size: 15px; color: #888">
              <a href='<%= "#{Discourse.base_url}/users/#{post.user.username}" %>'>
                <%- if show_username_on_post(post) %>
                  <%= post.user.username %>
                <% end %>

                <%- if show_name_on_post(post) %>
                  - <%= post.user.name %>
                <% end %>
              </a>

              <span> - </span>
              <span><%= I18n.l(post.created_at, format: :long) %></span>
            </p>
            <%= raw format_for_email(post, false) %>
            <hr />
          </div>
        <% end %>
        <a style='font-size: 12px; float: right;' href='<%= Discourse.base_url + topic.relative_url %>'><%= t('user_notifications.mailing_list.view_this_topic') %></a>
      </td>
    </tr>
    <tr>
      <td style='padding: 0 20px; font-size: 12px;'>
        <a href="#top"><%= t('user_notifications.mailing_list.back_to_top') %></a>
      </td>
    </tr>
  <% end %>
</table>