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Sorry, should have shown the NDR. &nbsp;<br />
<br />
<br />
550 5.1.1 RESOLVER.ADR.ExRecipNotFou<wbr />nd; not found<br />
<br />
thanks
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tech53

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Perfect. &nbsp;I followed your advice and problem sorted. &nbsp;But I'm curious to know, Should exchange not have updated the GAL with the new mailbox details or is that something stored in AD?
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--&gt;Should exchange not have updated the GAL with the new mailbox details or is that something stored in AD?<br />
Exchange will do by itself.
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You have another question after you received your answer and solution but here I go.<br />
<br />
The issue is not with exchange itself. &nbsp;The issue is the client (outlook). &nbsp;The client still have the old recipient id when the user select the name of the recipient from his/her cached drop down list or replies to an old email. &nbsp;It is kind of a simple change but to make the users understand it and actually make the change in their habits is quite different. Therefore, you doing the change in the user mailbox addresses is quite faster specially if this particular user receive emails from a vast majority of co-workers in the organization.
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<div class="content wysiwyg-content">
Hey Experts,<br />
<br />
I am beginning a migration to O365 from exchange 2010 and was checking the health of mailboxes prior to deploying the hybrid configuration.<br />
<br />
I discovered a user's mailbox that had corruption and to cut he story short, I had to delete the mailbox and re-create it (leaving the AD user account intact)<br />
<br />
All went well but now I have discovered that internal users get an NDR stating that the user cannot be found.<br />
<br />
I have tried:<br />
<br />
- to force an update on the OAB then forced outlook on another user's machine to download the OAB, <br />
- removed the entry from the other users NK2 files, <br />
<br />
It work fine when I use OWA to send mail to the new mailbox which leads to believe that there's a problem with distribution of the OAB.<br />
<br />
Anyone assist me with this?<br />
<br />
Thanks
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Hey Experts,

I am beginning a migration to O365 from exchange 2010 and was checking the health of mailboxes prior to deploying the hybrid configuration.

I discovered a user's mailbox that had corruption and to cut he story short, I had to delete the mailbox and re-create it (leaving the AD user account intact)

All went well but now I have discovered that internal users get an NDR stating that the user cannot be found.

I have tried:

- to force an update on the OAB then forced outlook on another user's machine to download the OAB, 
- removed the entry from the other users NK2 files, 

It work fine when I use OWA to send mail to the new mailbox which leads to believe that there's a problem with distribution of the OAB.

Anyone assist me with this?

Thanks

internal senders can send mail to user with new mailbox

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.