Hi,
We have setup office365 hybrid configuration on exchange 2010 sp3 cas/hub server. We can move mailbox from exchange to office365 successfully. But we are facing mail flow problem. We have selected option "Route all Internet-bound messages through on-premises Exchange servers" in hybrid configuration. We have xxxx.onmicrosoft.com domain as default.
1. We cannot send mail from on premise mailbox to office365 mailbox. We get NDR with like Mail is looping.
2 Office365 mailbox cannot send or receive mail to external domain.(like yahoo mail, Gmail)
3. Office365 mailbox cannot send mail to on premise mailbox.
4. Office 365 mailbox sends mail to another office365 mailbox.
Please help me to troubleshoot this. This is very critical.
Thanks & Regards