email bouncebacks

I've just aquired a new client and I'm hosting email services with them. during the changeover and data migration the old vendor exported all the mailboxes to pst files and gave them to me. I've imported all their old emails successfully into their new email boxes. The problem is whenever they reply to one of the old emails the email immediately bounces back and says:
The message could not be delivered because the recipents destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient.

All new emails are coming in and all new emails are working with replies and new. The old email domain is being forwarded to my new exchange server. What can I do to make the replies work on the new emails system?
knfitzAsked:
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rrozier38930Commented:
purge the DSLAM
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knfitzAuthor Commented:
How do I do that?
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waynej1979Commented:
Did you copy the nk2 file as part of this process? I have seen this with outlook before where it still references the old server. Get them to delete the entry from autocomplete in outlook and manually enter the recipient email address
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knfitzAuthor Commented:
when I said exchange, did you understand that I meant an exchange 2003 server and not a DSL line?
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knfitzAuthor Commented:
No, no nk2 file, I was planning on copying that later. they have new profiles.
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waynej1979Commented:
When they reply to the old email can they remove the recipient and manually enter it, see if that works?
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knfitzAuthor Commented:
I tried that and it still doesn't work.
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waynej1979Commented:
Is it particualr recipients who were within the old exchange organisation that you cannot reply to or is it just anyone from the old pst import?
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knfitzAuthor Commented:
anyone from the old pst import
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knfitzAuthor Commented:
whats a dslam that rrozier was talking about?
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waynej1979Commented:
No idea what DSLAM is, never come across that before?? Very strange error, normally NK2 file is the culprit with this error.
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knfitzAuthor Commented:
I'm double checking the last question about whether or not it was within the old exchange organization. If it is what does that tell us and what is the fix?
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knfitzAuthor Commented:
ok, they appear to be bouncing back from all email addresses from the pst import.
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knfitzAuthor Commented:
it appears some of the names may be slightly misspelled. For instance some named Jeff long may have been jeffrey long, but the email address is still jlong at something. would that have anything to do with it? since the to field is the friendly name and not the full email address, do they need their nk2 file? or would copying the nk2 file cause problems?
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knfitzAuthor Commented:
I just ran some test and it appears that if you delete the name and type it in then the email goes through. at least it hasn't bounced back right away. Is there a fix for this?
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knfitzAuthor Commented:
OK, I just got some replies, so it's definitely only happening when you reply. If they delete the name and type in the email address, then it goes through.
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knfitzAuthor Commented:
Would copying in the old NK2 files fix this, or woudl that cause problems also?
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knfitzAuthor Commented:
I'm not trying to bug you guys, but I have some upset office workers over this, I would really appreciate a fix today. does anyone else have any ideas?
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knfitzAuthor Commented:
I found this article that looks like it might work. Can anyone see a problem with trying this?
http://blogs.technet.com/b/sbs/archive/2009/05/21/cannot-reply-to-old-emails-or-modify-old-calendar-items-after-pst-mail-migration.aspx
in there situation, they migrated with pst but the old exchange was joined with 2 others with one of the 2 new.
In my situation, I'm completely seperate. would the X500 value still work?
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knfitzAuthor Commented:
OK, the article didn't work
I selected one of the replies and did a right click copy on the name and on th egeneral tab, in the display field, it has the ou path from the old active directory domain. It starts with
OU= Old domain name
How do I fix that? Or can I?
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Mark DamenERP System ManagerCommented:

Yes, X500 connectors would likely solve this issue.  I've migrated from in house exchange 2007 to hosted exchange 2007.  When I removed a mailbox against an AD account, I would simultaneously mail-enable the domain user with an email address that resolves on the hosted platform.  I'd also add their legacyDN as an X500 address in the ADUC, rather than by modifying the AD directly.
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knfitzAuthor Commented:
will this work if the old AD account no longer exists?
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knfitzAuthor Commented:
I added the legacy dn from the new domain instead of the old domain, so that's probably why it didn't work. The old vendor is not being very responsive right now. Is there a way to look up the legacy dn from the old domain from these emails, or something?
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Alan HardistyCo-OwnerCommented:
Please see Jamestechman's comment (in green) in the following question:

http://social.technet.microsoft.com/Forums/en-US/exchangesvrgeneral/thread/0a346321-ba3a-49a2-b714-b7d1fd21a481
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Mark DamenERP System ManagerCommented:
Yeah you can get the legacy dn by double clicking on persons name in outlook, or an email you sent or received from a user.
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knfitzAuthor Commented:
I tried to enter the legacy DN by adding the legacy dn string. Here's the string I added:
/o=Appnuity Colocation Services/ou=First Administrative Group/cn=Recipients/cn=kjones

Do you see anything wrong with this? I'm still getting a bounce back. In the otehr field when I added this I typed X500. I'm still getting bounce backs. Is there a service that needs to be restarted or does it take awhile for the change to take effect?
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knfitzAuthor Commented:
the old domain is no longer networked with the new email system. Could that have somethign to do with this?
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Alan HardistyCo-OwnerCommented:
Have you added the:

/o=Appnuity Colocation Services/ou=First Administrative Group/cn=Recipients/cn=kjones

to the MailNickName attribute using ADSIEDIT?
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