We have migrated an email domain xyz.com from an Exchange 2010 server to O365. We have other email domains on this Exchange server. All external email is going fine to mailboxes in O365. Internal email originating from the Exchange server from other domains is not reaching mailboxes in O365 but still reaching their old mailbox on Exchange server.
I have hidden the mailbox of xyz.com's users in Exchange, removed xyz.com as Authorative domain from Exchange server, created a send connector to bypass anti-spam filter and send email destined for xyz.com directly using MX record. But emails from other internal domains are still being recieved only on Exchange server not on O365
Please advise any steps I can take to troubleshoot further