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Out of office and Forwarding rule cause -e-mail to loop

By alan.roper1 ·
Can anyone give any suggestions other than not using forwarding with out of office. I think turning off delivery and read receipts when this is enabled could help.

We are currently running Exchange 2003 (version 6.5.7226.0) on Windows
2003 Enterprise Edition. The currently environment is Active/Passive in
a cluster environment. Couple of days ago we had an incident were a user
had set up an Out of Office rule and added a additional forwarding rule
to herself four times!, which was set up on Out of Office assistant in
the 'Add Rule' function, because of this action this had cause a email
loop to occur where this user had generated over half million emails in
her inbox and causing the rest of the users who reside on that
particular Exchange Backend server unable to send or receive emails.

Nevertheless we managed resolve the Email looping, but I am bit concern
about this incident, as it is the first time we have ever encounter an
email looping since we have migrated over to Exchange 2003 from Novell
GroupWise 5.5 four years ago.

From discussing this with our Support Company there was suggestion of
disabling Out of Office Assistant, preventing users from doing this
again, unfortunately this would not be feasible as Out of Office
Assistant is widely used in our Organisation.

I don't believe that we are the only ones who have had this kind of
email looping in Exchange. I was wondering if you guys have seen this
kind of issue before and what is the recommended fix that we can
implement to prevent this from happening again?

One final question, if we have another email looping incident again
before this issue is permanently fix, are there any official guide lines
on how to properly troubleshoot email looping?

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