Test account reported as MSExchange ADAccess error ?

Hi,

I'm using Exchange Server 2010 SP3 and during the health check, I noticed that the following event is logged intermittently (random) no specific pattern:


Log Name:      Application
Source:        MSExchange ADAccess
Date:          12/04/2015 2:17:28 PM
Event ID:      2156
Task Category: Validation
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      PRODHTCAS01-VM.domain.com
Description:
Process w3wp.exe () (PID=4516). Recipient object CN=dummy user2,OU=Old Employees,DC=domain,DC=com read from DC2k3-02-VM.domain.com failed validation. A data validation exception will be given.  Set event logging level for Validation category to Expert to get additional events about each failure.

So I wonder if this is a real security issue from external people or this is can be ignored after deleting the user account drom AD console ?
LVL 10
Senior IT System EngineerIT ProfessionalAsked:
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LeoCommented:
that account might have corrupted or have incomplete values....can disable it.....see this link for further details....

https://social.technet.microsoft.com/Forums/exchange/en-US/905442d8-756e-462c-b81c-df7e856ccd81/event-id-2156-msexchange-adaccess?forum=exchange2010
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks !
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