Sanitize HTML mails for email client in iframe.rb

class HtmlEmailSanitizer < HTML::WhiteListSanitizer
    self.allowed_tags           = Set.new(%w(strong em b i p code pre tt samp kbd var sub
      sup dfn cite big small address hr br div span h1 h2 h3 h4 h5 h6 ul ol li dl dt dd abbr
      acronym a img blockquote del ins html head body title))

    self.allowed_protocols      = Set.new(%w(http https mailto cid))
end