We are getting 9217 error on one of exchange HUB/Transport servers recently. I did cleanup of LegacyExchangDN in AD but still getting the error. We have three Hub/Transport Servers but only one of them populated with 9217 error. Much appreciate if anyone can share how to fix this issue. Thanks !

https://social.technet.microsoft.com/Forums/en-US/6fee54f2-4345-471b-bb62-04a7d75bc02e/msexchangetransport-9217-imceaexadcdisabledmaildomaincom?forum=exchange2010

Log Name:      Application
Source:        MSExchangeTransport
Event ID:      9217
Task Category: Categorizer
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      ExchangeHUB1
Description:
More than one Active Directory object is configured with the recipient address IMCEAEX-ADCDisabledMail@domain.com. Messages to this recipient will be deferred until the configuration is corrected in Active Directory.

Hello

Please find out which 2 objects in AD are configured with  IMCEAEX-ADCDisabledMail@domain.com smtp. it seems you are unable to find the duplicate entry. Also check some disabled account etc. you can also try 

Get-MailboxDatabase | clean-mailboxdatabase

Thanks for replying. I searched the AD with following command but couldn't find any.

Get-Mailbox -resultsize unlimited  | where {$_.EmailAddresses -like "*IMCEAEX-ADCDisabledMail*"}

Can you let me know What "Get-MailboxDatabase | clean-mailboxdatabase" will do to resolve the issue ?

Sometimes there is some attributes already been removed but still exist. It will update your disconnected mailboxes details as well.

Thanks for replying.  Is there any impact running clean-mailboxdatabase during office hours?

Hi,

Please run the following command in Windows PowerShell to have a try:

Get-ADObject -LDAPFilter "(&(objectClass=user)(objectCategory=person)(legacyExchangeDN=ADCDisabledMail))" -Properties LegacyExchangeDN | Set-ADObject -Clear LegacyExchangeDN

Regards,

there is no impact, it will also help you to see the disabled mailboxes which are not visible in disconnected mailbox console.