We came across an issue recently where we have a few alerts flagged up on our monitoring system (SCOM 2007 R2) in regards to the below Exchange error.
Object [CN=Test,OU=Test,DC=Test,DC=com]. Property [HomeMtaServerId] is set to value [Test.com/Configuration/Deleted Objects/Microsoft MTA
DEL:Guid], it is pointing to the Deleted Objects container in Active Directory. This property should be fixed as soon as possible.
The issue is as said above that the HomeMTA value is set to deleted objects.
You can run the following in the Exchange Management Shell to quickly resolve the issue, add the username above into the below PowerShell command. This will correct the HomeMTA value to the correct setting.
Get-Mailbox “MailboxMentionedAbove” | update-recipient