path: root/app/views/mailer/message_posted.rhtml

<%= l(:field_author) %>: <%= @message.author.name %>
<%= url_for :only_path => false, :host => Setting.host_name, :controller => 'messages', :action => 'show', :board_id => @message.board_id, :id => @message.root %>

<%= @message.content %>