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I have deleted all his cache email addresses and &nbsp;pull the names from Global address list. Also I recreated Roam cache folder . But still facing issue.
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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.

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Does the it work for a while and then the problem comes back or does it not work at all?
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Does the it work for a while and then the problem comes back or does it not work at all?

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it does not work for few users
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Another words, if you apply the fix in outlook does it resolve the problem but then a few days later, the problem comes back? &nbsp;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.<br />
<br />
Also, did you migrate these user to the new server from a PST file?
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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?

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they are able to send email from webmail
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<div class="content wysiwyg-content">
we have users migrated from &nbsp;domainA to another domain B<br />
<br />
but from &nbsp;domain A any users send email to any DOMAIN B users who were migrated from domain A and they get below mentioned error message. <br />
#550.5.1.1 resolver.adr exrecip not found even they have valid domain b email address<br />
<br />
As per error it is trying to find As per the error message it is trying to find email address “@domain A.com” .
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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 A.com” .

exchange, email

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.