Hybrid mail flow

[CAWJames]

Hi all,

 

Another issue for our students in Office 365.

 

Currently we run a hybrid Ex2010 enviroment with all our mail running through EOP.

 

All our on-prem boxes(staff) work fine, mail in, mail out, but our newly created cloud-only accounts(students) won't get any email, the sender just gets an #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## NDR back

 

There must be somewhere for Ex2010 to see the cloud only addresses for routing, anyone any idea what we are doing wrong? do we have to have remote mailboxes for each O365 cloud user(which seems a major faff!)

 

Thanks

 

James