#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found

Hi Experts,

When a certain user send an email to another internal email address, he always get the #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found. The full error message is below:

IMCEAEX_O=SIMEX+20ORGANIZATION_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=user1@domain.com
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

The person "user1@domain.com" is no longer at the company resulting in the error. How do I get rid of this email address from our Exchange 2007 server?
jnsimexAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:
1st option is to delete that entry from outlook cache and add as a new entry. Outlook see that as a different user which is not existing.
https://support.office.com/en-us/article/Delete-a-name-from-the-Auto-Complete-list-2e3d8fb1-eefd-4307-ab73-6f2f23164222?ui=en-US&rs=en-US&ad=US

2nd option is to convert the NDR to X500 and add it into the new mailbox.
http://blog.westurn.net/2013/04/convert-ndr-to-legacyexchangedn-x500.html
https://support.microsoft.com/en-us/kb/2807779

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systechadminConsultantCommented:
Also check the if the non existing user was not setup as delegate in outlook for anyother mailbox
jnsimexAuthor Commented:
Thanks Experts!
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