I was wondering: Can you use multiple email servers at once? In this case, I was going to add all the Google Apps MX records then add the MX records of another email server.

My goal here is to only use the somewhat expensive Google Apps for only important email addresses (eg all the employees), then use the other cheap email server for other email addresses like webmaster and some other unimportant but needed emails.

My thought is that a mail message would try the first 5 Google Apps mail servers, fail, then go to mine and succeed.

Would this work? If not, are there any other options?