code: function parseSubaddress(user) {
  	var parsed = {
  		username: user
  	};
  	if (user.indexOf('+')) {
  		parsed.username = user.split('+')[0];
  		parsed.subaddress = user.split('+')[1];
  	}
  	return parsed;
  }
docs: Parse the address - Useful for checking usernames in rcpt_to