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E.g., 2 users have auto-reply configured. User A sends a message to User B. User B's auto-reply gets sent to User A's mailbox. That, in turn, causes an auto-reply to be sent from User A and insanity ensues.

How does Exchange 2010 prevent this scenario?

Also, can Exchange 2010 prevent a user's mailbox sending more than one auto-reply to the same user in one day?

Bonus: Assuming Exchange prevents this, how do I configure the settings?

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Why would you want to configure it? It works fine. Use your time on problems :) –  pauska Jun 6 '11 at 17:31
    
I just want to know what options are available. We are migrating from another mail system and administration might want to reproduce the way our current system works. –  Belmin Fernandez Jun 7 '11 at 12:12
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@Pauska: do you mean use your time to solve problems or make more? I'm pretty good at both. –  Bart Silverstrim Jun 7 '11 at 16:39
    
Ah, sysadmin banter. Appreciated by so few. –  Belmin Fernandez Jun 7 '11 at 17:14
    
+1 for offering a bonus question. –  james.garriss Feb 21 '13 at 19:40
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3 Answers

up vote 10 down vote accepted

Auto replies only get sent once per sender, per activation. There is no auto-reply loop with Exchange systems. Microsoft KB

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To be clear, they are sent once per Sender. –  joeqwerty Jun 6 '11 at 17:26
    
Thanks @joeqwerty, I was trying to find the right term... I'll change it. –  Holocryptic Jun 6 '11 at 17:26
    
Glad to pitch in. –  joeqwerty Jun 6 '11 at 17:28
    
Thanks gentlemen. Do you know of any official documentation of this behavior? –  Belmin Fernandez Jun 7 '11 at 12:21
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added link for referrence –  Holocryptic Jun 7 '11 at 14:33
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the header is x-auto-response-suppress:all is sent by default on auto replies. That in conjunction with x-ms-exchange-inbox-rules-loop (which contains the sender email address), should resolve any potential loop conditions.

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So another system could also use this header to prevent an auto reply loop correct? –  Belmin Fernandez Jun 7 '11 at 12:14
    
not that I am aware of –  Jim B Jun 7 '11 at 12:32
    
Exchange often strips Exchange-specific headers as messages leave the organization, @Beaming, so you need to find out whether this header is stripped. –  james.garriss Feb 21 '13 at 19:44
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You can get around the one per sender restiction. In auto reply create a rules and a template and set as reply to all The sender will receive 2 emails on first contact. Then just one on second contact.

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