code: def search_for_subject(self, subject, timeout=None, content_type=None):
          
          return self.search(timeout=timeout,
                             content_type=content_type, SUBJECT=subject)
docs: Get content of emails, sent to a specific email address.
          @Params
          email - the recipient email address to search for
          timeout - seconds to try beore timing out
          content_type - type of email string to return
          @Returns
          Content of the matched email in the given content type