Exchange 2003 Internal Mail bounce

Our domain (eg: xyz.com) has got POP3 and exchange account users. The exchange server is exchange 2003. Recently one of the users exchange account was shifted back to POP3 account and I have removed that user from AD users and computers. I was able to configure his POP3 email account, but when our exchange internal users send emails to him, it bounce back with the below

  IMCEAex-_O=ENHANCEUAE_OU=FIRST+20ADMINISTRATIVE+20GROUP_CN=RECIPIENTS_CN=
i then deleted the mailbox also but when i checked in Exchange Systems Manager and mailboxes I can see his mailbox there. How to solve this issue?
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kurajeshSenior Systems AnalystAsked:
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AmitConnect With a Mentor IT ArchitectCommented:
yes you need to create X500 also.
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AmitIT ArchitectCommented:
Add custom X500 address in this user properties with old legacy exchange dn value. For more details check this:
https://www.simple-talk.com/sysadmin/exchange/exchange-e-mail-addresses-and-the-outlook-address-cache/
http://msexchangeguru.com/2012/03/15/x500/
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kurajeshSenior Systems AnalystAuthor Commented:
Hi thanks,

Mine is exchange 2003 server and how do we change this then in this case
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AmitIT ArchitectCommented:
For 2003 you need to use dsa.msc snap-in. Search for the user, goto properties, under email address tab, you need to add X500 custom address.
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kurajeshSenior Systems AnalystAuthor Commented:
in the user there is already a x400 address is there, so do we need to create another x500 also
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kurajeshSenior Systems AnalystAuthor Commented:
just wanted to inform you that I had deleted that users mailbox and now there is no email address in properties

my question is

1) do we need to create a mailbox in "exchange tasks"
2) if so how do we get the details of legacy exchange dn value?
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AmitIT ArchitectCommented:
Yes, you need to recreate the mailbox again. Legacy dn value you can get from bounce back message.
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kurajeshSenior Systems AnalystAuthor Commented:
i did check the bounce back message and i noted the below

IMCEAex-_O=domainname_OU=FIRST+20ADMINISTRATIVE+20GROUP_CN=RECIPIENTS_CN=email id

so what will be the exact value to be added in x500, please let me know
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kurajeshSenior Systems AnalystAuthor Commented:
hi amit,

i have added the legacydn value and i found the value by the following command(hope it is correct).
csvde -f c:\users.csv -r (sAMAccountName=AnujP) -l "name,givenName,sn,displayName,sAMAccountName

then added the value in emaild id and type as x500.
now NDR is not receiving.

but mails not coming to his inobx also.

i can see mails in exchange owa but since his accout is now a pop3 account only external mails only comes.
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