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Possible Duplicate:
Vacation Response Loop
What would happen if you sent an email to someone, who has an out-of-office auto-response set up, while you yourself also have an out-of-office auto-response set up.
Would this create an infinite loop and crash the email server?
1I moved my answer to the duplicate question, but the answer is that e-mail servers use the message id to prevent this from happening. – KCotreau – 2011-07-27T15:36:41.277