EXCHANGE 2010

some users mail boxes got migrated from USER@domainA.COM  to different doman i.e user@domain B.com

that users @domainA.com (non migrated) are getting undeliverable message when they send to users @DomainB.com( both migrated & non migrated), Please see the error message .

As per the error message it is trying to find email address “@domainA.com” for users who are in @domainB.COM.

They are able to send email from their webmail . We tried outlook level troubleshooting like cleared autofill cache and pulled the recipient name from GAL, but no luck

is it something to do with LegacyDN attribute of contact object in domain A.COM?
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pramod1Asked:
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Derek SouterITO Svc Delivery Cons IIICommented:
you say that you tried clearing the autofill cache - and pulling from the GAL (the first two things I would try).  have you tried manually typing the new email address within Outlook?

as the email routing is working (you say that email from Webmail works), the issue would appear to be within Outlook.
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pramod1Author Commented:
should I delete the nk2 file also
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Derek SouterITO Svc Delivery Cons IIICommented:
the NK2 file is the autocomplete list (nickname file) - the autofill cache

try a simple test - start typing the name of a user that has been migrated, then delete it (press the delete key, or backspace - it should delete it from the cache)

then type the new email address in (or choose them from the GAL - assuming the GAL has been updated and shows the new email address)

if that works, then you just need to delete the old entries from all the NK2 files (there are ways to do that automatically for all users) - or give your users instructions on how to carry it out themselves
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