exchange, email

we have users migrated from  domainA to another domain B

but from  domain A any users send email to any DOMAIN B users who were migrated from domain A and they get below mentioned error message.
#550.5.1.1 resolver.adr exrecip not found even they have valid domain b email address

As per error it is trying to find As per the error message it is trying to find email address “@domain” .
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Joe FulginitiNetwork EngineerCommented:
I had the same exact problem.  It is caused by outlook having an incorrect autocomplete entry.  See the attached microsoft document:

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pramod1Author Commented:
I have deleted all his cache email addresses and  pull the names from Global address list. Also I recreated Roam cache folder . But still facing issue.
Joe FulginitiNetwork EngineerCommented:
Does the it work for a while and then the problem comes back or does it not work at all?
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pramod1Author Commented:
it does not work for few users
Joe FulginitiNetwork EngineerCommented:
Another words, if you apply the fix in outlook does it resolve the problem but then a few days later, the problem comes back?  I ran into this and it is caused by replying to an old email which recreates the original problem. If they do, you will need to remove the autocomplete entries again.

Also, did you migrate these user to the new server from a PST file?
pramod1Author Commented:
no not from pst
pramod1Author Commented:
they are able to send email from webmail
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