/**
     * Does some email address checking.
     * @param email
     * @return true if it looks OK, false otherwise
     */
    public boolean isValidEmail(String email) {
        String domain   = null;
        try {
            // Does it have an @ in it?
            if ( email.indexOf("@") == -1 ) {
                return false;
            }

            domain   = email.split("@")[1];
            String mxHost   = getBestMxHost(domain);
            if ( mxHost == null ) {
                // Should we return false here? It's possible to have emails set
                // up to be delivered by A records too.
                logger.debug("Can't find MX record for " + domain);
                return false;
            }

            return true;
        } catch ( NameNotFoundException nnfe ) {
            logger.error("Domain " + domain + " not found - " + nnfe.getMessage());
            return false;
        } catch ( Exception e ) {
            logger.error("", e);
            return false;
        }
    }