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Internal NDR after Exchange migration to Office 365

Hi, I just migrated our old Exchange 2003 server to Office 365. Everything is running well, except we are getting NDR's when sending internal email. Does this have something to do with how the old Exchange server sent internal mail?

IgniteITNS

ASKER

So it looks like this is an Active Directory issue. When a user selects a coworker from the Contacts list, the email will go through and autocomplete will fix the email address. But you have to send them an initial email first.

ArneLovius

to expand on IgniteITNS

if people are using saved autocomplete entries, these will fail as although the display name will remain the same, the back end data has changed.

Maen Abu-Tabanjeh

what the NDR code?

ASKER CERTIFIED SOLUTION

Member_2_6515809

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ArneLovius

@BlueCompute beautifully written

Member_2_6515809

Thanks ArneLovius - I'm thinking of turning some of my answers here into blog posts or a pewrsonal KB so I'm trying to make them as complete and clear as possible without going overboard.

IgniteITNS

ASKER

I've requested that this question be deleted for the following reason:

was typed in by ex employee,

ArneLovius

You seem to be saying that multiple users have access to a single account.

https://www.experts-exchange.com/terms.jsp

If you register for Services, these Services are for the registered user ONLY and may not be shared or features transferred to others

IgniteITNS

ASKER

No what I'm saying is that the IT guy I paid who was using this account was let go. I am now doing his job. Only one user guys....

ArneLovius

I am 100% sure that the answer provided by myself and exceptionally well described by BlueCompute is correct.

I would split the points 50/50 across posts 38779740 and 38780856

The issue of an account being " transferred to others" ...