Re: Using Exchange and GMail Hosted
No. That’s not how MX priorities work. Having two MX records with the same priority will not cause the email to be delivered to both. It will cause the email to “round robin”, so some email will go to one host and some email will go to the other host.
IMHO, the best you could do would be to set up Contacts in your AD for all the GMail addresses and set up forwarding on the user accounts to forward a copy of all email to the Contacts.