anchor.diff:              <%= link_to(letter.id, letter_path(letter, style: letter.default_style), target: 'mail') %>
             </td>
             <td><%= letter.sent_at %></td>
  +          <td>
  +            <%= link_to delete_letter_path(letter), :method => 'delete', data: { confirm: 'Are you sure you want to delete this email?' } do %>
  +              <span class="pull-right">
  +                <i class="icon-remove-circle"></i>
  +              </span>
  +            <% end %>
  +          </td>
           </tr>
         <% end %>
       </tbody>
  
positive.code:             <%= link_to(first_letter.id, letter_path(first_letter, style: first_letter.default_style), target: 'mail') %>
            </td>
            <td><%= first_letter.sent_at %></td>
          </tr>
        <% end %>
        <% @letters.each do |letter| %>
  
negative.code:       <tr>
          <th>ID</th>
          <th>Sent at</th>
          <th>Action</th>
        </tr>
      </thead>
      <tbody>
  