Hi,
Is there a document on how manage the MX record during a migration from an on-premises Lotus Domino to Exchange Online? I've seen a technote related to Lotus Domino and Exchange 2013 in which it is possible to create an Internal Relay Connector to send email from Exchange to Domino.
I think this is possible also on Exchange Online so during the migration I'll change the mx records pointing at Exchange Online and then create the relay connector: when the mailbox is still on the internal lotus domino, O365 will forward the email to the internal user, isn't it?