app/views/user_mailer/featured_photo.html.erb
<div class="section">
<div class="section-wrap info">
<div class="section-item">
<div class="section-title">
<%= link_to t("mail.featured.title"), explore_url %>
</div>
</div>
</div>
</div>
<% @featured.each_with_index do |image, i| %>
<div class="section section-image" id="image-<%= image.id %>">
<div class="section-wrap">
<div class="section-item">
<div class="section-title">
<%= link_to image.title, controller: "image", action: "item", id: image.id %>
</div>
<div class="section-content">
<%= link_to(image_tag(attachments["feature_#{i}"].url, width: 520, height: 520, alt: "feature photo ##{i}"), controller: "image", action: "item", id: image.id) %>
</div>
</div>
</div>
</div>
<% end %>