Hi all,

On my Exchange Server 2010 SP3, many MSExchangeIS 8528 events are logged about a user who has not mailbox and no AD account. What the hell ? This user seems to be named like "userGUID". In my case the cn is "userd954b7ed".

An idea about that ?

Than

Hi

Look at Rich answers here and try what was said:

https://social.technet.microsoft.com/Forums/exchange/en-US/8cda3541-7f6e-4158-8420-665393f72532/msexchangeis-id-8528-strange-sufix-numbers-added-to-username

Hi,

The "/O=xxx/OU=xx/cn=Recipients/cn= userd954b7ed " typically is the legacyExchangeDN value of the mailbox.

So please try this to find that mailbox:

Get-mailbox "/O=xxx/OU=xx/cn=Recipients/cn= userd954b7ed"

Best Regards.

Hi all and thank you for your answers.

Lynn, the Get-mailbox "/O=xxx/OU=xx/cn=Recipients/cn= userd954b7ed" returns an existing and active mailbox with the correct alias. So why Exchange uses this strange user name ?

Strange to, Exchange logs many warnings about this mailbox with the strange user name (about 4 warnings every 5 minutes).

Re

Hi,

Email addresses in the From, To, and other fields are resolved to legacyExchangeDNs and stored in the message. When you reply to a message, we expect to be able to resolve that legacyExchangeDN. If we cant, it causes an NDR. The LegacyExchangeDN value of a user might corrupt in migration scenarios.

Best Regards.

Hi,

OK I understand that, but our Exchange 2010 is a fresh install. No Exchange server before that.

How to resolve