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OOF Auto Reply "Loops" when addressed to internal invalid recipients

Out of Office Auto Reply "Loops" when addressed to internal invalid recipients - only when SMTP Connector is configured

Has anyone had this problem in the past and resolved? 


Steps to reproduce:

I added an SMTP Connector to route mail through a designated smart host. Previously I had no SMTP connectors configured.

The following scenario happens:

1- A NULL (Fake/Invalid) internal sender sends an email to an internal recipient (we have many of these in our organization that send mail, generally from a service or application, however, it's also a concern for spoofing sender addresses)

2- If the internal recipient has their out of office enabled, it responds to the null sender

The auto response addressed to the null sender causes a continuous loop (verified through message tracker).

Message Tracker Shows:

SMTP: Store Driver: Message Submitted from Store 

SMTP: Message Submitted to Advanced Queuing 
SMTP: Started Message Submission to Advanced Queue 
SMTP: Message Submitted to Categorizer 
SMTP: Message Categorized and Queued for Routing 
SMTP: Message Queued for Local Delivery 
SMTP: Message Delivered Locally to invalid address @ internal domain .com
SMTP: Store Driver Submitted Message to MTA 
SMTP: Store Driver: Message sumitted from Store 
SMTP: Message Submitted to Advanced Queuing 
SMTP: Started Message Submission to Advanced Queue 
SMTP: Message Submitted to Categorizer 
SMTP: Message Categorized and Queued for Routing 
SMTP: Message Queued for Local Delivery 
SMTP: Message Delivered Locally to invalid address @ internaldomain .com
** The above "loop" repeats approximately 6 times per minute. 

Problems: 

-There is no NDR generated

- The transaction log grows at an exponential rate as more and more "loops are created by users who have their out of office enabled and begin auto replying to the null senders.

- Additional CPU, memory and swap space is consumed.

- After a period of time, the mailstore dismounts for unknown cause - possibly due to file space, memory resources unavailable, cpu unavailable...

Temporary Resolution:

When the connector is deleted, the message sender immediately receives an NDR that the message was unable to be delivered and the "loop" stops.

Environment:

Server 2003 R2 Standard SP2

Exchange 2003 Enterprise



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