code: @Nullable
  	public static String encodeText(@Nullable final String name) {
  		if (name == null) {
  			return null;
  		}
  		try {
  			return MimeUtility.encodeText(name);
  		} catch (final UnsupportedEncodingException e) {
  			throw new IllegalArgumentException(e.getMessage(), e);
  		}
  	}
docs: To make sure email clients can interpret text properly, we need to encode some values according to RFC-2047.