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Users able to reply after migration

Hi guys,

So we are about to migrate a small group of mailboxes from one tenant to another and my question is if the users can reply to migrated emails when the logon to the new tenant?

From what I can remember back in the days (or might still be applicable) one have to do something with the X500 protocol or ExchangeLegacyDN?

So...

1) Do we need to do something on the target mailboxes so they are able to reply to migrated email?

2) What is needed to be changed/added?

3) Is this applicable even if the source tenant are only cloud-ids and have not been migrated mailboxes from an on-premises enivronment.

Thanks!