i migrated 3 mailboxes from our on-premises exchange server to office 365. when sending emails from the 3 office 365 to on-premises users the emails are not received.Sending emails from office 365 to external is fine and emails from on-premises to Office 365 is also ok. from technet, there was a suggestion to set the domain to "internal relay" i did that and it did not fix the issue. the mx record is not yet pointed to microsoft. what could be the cause?
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