Dear Folks,
A customer is running with Exchange 2010 SP3. for outgoing emails, it submits emails to Smart Host and for Incoming emails it lands to Yahoo as MX points to Yahoo DNS and through a POP utility, On Premises Exchange fetches emails.
Now, we have introduced Hybrid Exchange in the environment and we have moved couple of test mailboxes to Exchange Online. After this change
On premises users can send emails to Exchange Online users but Exchange Online user can not send email to On premises users
Similarly, Exchange online users can send email to hotmail, yahoo but can not receive emails from hotmail/ yahoo/ external domains.
please note we needed to modify Inbound/ Outbound connectors to define yahoo MX and our Smart Host IPs.
please assist what else do we need to consider?
Thanks, Sheeraz