mailr/themes/olive/views/messages/_header.html.erb

<div class="msg_header">
    <%= raw mail_param_view(@message,"from_addr",address_formatter(@message.from_addr,:message)) %>
    <%= raw mail_param_view(@message,"to_addr",address_formatter(@message.to_addr,:message)) %>
    <%= raw mail_param_view(@message,"subject",@message.subject) %>
    <%= raw mail_param_view(@message,"date",date_formatter(@message.date)) %>
    <%= hidden_field_tag 'uids[]', @message.uid %>
    <%= hidden_field_tag 'id', @message.id %>
    <%= hidden_field_tag 'source', 'show' %>
</div>