Meeting Request Acceptance generates a system undeliverable message

When a particular user sends out a meeting request and invited attendees respond by accepting the request, the invited attendees receive a message from System Admin stating that "The e-mail account does not exist at the organization this message was sent to."  The email account is one that has been deleted from AD and purged from exchange.  The email account used to be the meeting requesters secretary that has left.  Somehow the users outlook is configured to send to this account as well.  Since the AD account has been deleted it rightfully sends the system admin message.  I cannot find in the users Outlook where it may be configured to send to this deleted account.  It is not in delegates and it also happens via OWA as well.  Sounds like a simple issue to resolve however I cannot seem to find where this configuration was made.
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David LeeConnect With a Mentor Commented:
Hi, kvella.

This is a well known problem in Outlook.  The problem is caused by delegation.  When the secretary's account was deleted the hidden rule that forwards items from the account holder to the delegate wasn't removed.  The way to prevent this in the future is to remove departing delegates before deleting their account.  Try following the steps from this page to fix the problem.
kvellaAuthor Commented:
Thanks so much.  Makes sense.  This solved the problem.
David LeeCommented:
You're welcome.
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