Introduce Split Email Delivery
Enable Admin to Setup Split Email Delivery, When they need to manage a part of the users in Office365 and route the rest to another server
Richard Casalina commented
This would be a very useful feature
E.g. We are a small business but have a website with online bookings etc. Out of 18 email addresses I only need 6 or 7 to be able to use an intranet site which is why I went for office365 for 3 users initially. These users are also the important ones and need to have the correct domain name for their email addresses. I understand I can use forwarding to get messages to the onmicrosoft accounts but can't do anything for sending.
Travis Newton commented
I'm surprised this doesn't have more votes - this is a feature in Zoho Mail and Google Apps.