code: def escape_email_quoted_text(text, indent_txt='>>', linebreak_txt='\n'):
      
      washer = HTMLWasher()
      lines = text.split(linebreak_txt)
      output = ''
      for line in lines:
          line = line.strip()
          nb_indent = 0
          while True:
              if line.startswith(indent_txt):
                  nb_indent += 1
                  line = line[len(indent_txt):]
              else:
                  break
          output += (nb_indent * indent_txt) + washer.wash(line,
                                                           render_unallowed_tags=True) + linebreak_txt
          nb_indent = 0
      return output[:-1]
docs: Escape text using an email-like indenting rule.
      As an example, this text::
          >>Brave Sir Robin ran away...
          <img src="malicious_script />*No!*
          >>bravely ran away away...
          I didn't!*<script>malicious code</script>
          >>When danger reared its ugly head, he bravely turned his tail and fled.
          <form onload="malicious"></form>*I never did!*
  
      will be escaped like this::
          >>Brave Sir Robin ran away...
          &lt;img src="malicious_script /&gt;*No!*
          >>bravely ran away away...
          I didn't!*&lt;script&gt;malicious code&lt;/script&gt;
          >>When danger reared its ugly head, he bravely turned his tail and fled.
          &lt;form onload="malicious"&gt;&lt;/form&gt;*I never did!*
  
      @param text: the string to escape
      @param indent_txt: the string used for quoting
      @param linebreak_txt: in the text param, string used for linebreaks