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Delivery has failed to these recipients or groups: #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

IMCEAEX-_O=.....+20.....+20......_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=
Platform is Windows 2008 R2, Exchange 2010 SP3

Started when we lost a drive in our RAID array. Replaced drive and 10 hours later it was rebuilt.
Do to problems with the Exchange DB, I created a new DB and moved all mailboxes.  It appears right now we have this problem with two users.  Doesn't matter whether it's internal or external email.  Both users can send emails

Have followed other solutions i.e., clearing auto-complete and creating an X500 address. (Seems this has been the fix for many who have dealt with this problem).
Deleted one of the users, then created user and mailbox, still the same problem.

Need assistance!
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8/22/2022 - Mon
suriyaehnop

Does the issue still occured on OWA for these two user? Does it happened to new email?
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Happens in OWA as well.  Guessing turning off cached mode will not work, but I will try.  Where do I located the 'Legacy Exchange Name' entry in ADSIEDIT?  Have removed old servers this way but never saw individual mailboxes.
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ASKER
Guys, the X500 addition actually looks like it solved the problem, just took some time apparently.
Going to reward points anyway  for the effort.

Thanks!
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck