Intermintant delivery failures after new mailboxes created

We had an information store that had some corruption. We moved as many people off onto a new one as possible but were left with 4 we could not move. We tried a repair but it was taking too long so we canceled. This left the store unmountable.

Since it was just 4, we exported their email from the cached copy in Outlook, deleted the mailbox from the unmounted store, created a new one on the new store, and imported their email.

Everything is mostly working but intermiteantly they are getting non deliverable messages when someone from inside the company tried to send them an email. Email from outside seems to work all the time.

I tried several test from the Administrator account and was unable to get any failures but some internal people still get them.

Any ideas?

Thanks,
aegistpAsked:
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dexITConnect With a Mentor Commented:
Try re-creating an account and mailbox and see what the results are. I've previously supported an issue when migrating from 2003 to 2010, re-creating the account resolve the problem. Worth a shot.
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dexITCommented:
I would make sure they have the aliases they previously used, is it possible that users are sending mail to an alias that doesn't exist anymore. Check in Active Directory to verify.

Did you re-configure/modify the default send connector?
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aegistpAuthor Commented:
No missing aliases that I can see and we didn't modify the send connector at all.
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dexITCommented:
Hmm, OK. Have you tried re-creating a new user to see if that user receives the same results?

It's possible that another security identifier was created for the user.
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aegistpAuthor Commented:
All other users are fine but I didn't try to re-create them.

If it was a SID issue, don't you think it would be a problem for all email and not just intermitantly?
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dexITCommented:
Not exactly. If this is the case, I would double-check the internal send connector. This is occurring for 4 people, right? or everyone?
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aegistpAuthor Commented:
Just the 4 that got new mailboxes.
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