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?

  • 1
    Why would you want to configure it? It works fine. Use your time on problems :)
    – pauska
    Jun 6, 2011 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. Jun 7, 2011 at 12:12
  • 1
    @Pauska: do you mean use your time to solve problems or make more? I'm pretty good at both. Jun 7, 2011 at 16:39
  • Ah, sysadmin banter. Appreciated by so few. Jun 7, 2011 at 17:14
  • +1 for offering a bonus question. Feb 21, 2013 at 19:40

3 Answers 3


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

  • 3
    To be clear, they are sent once per Sender.
    – joeqwerty
    Jun 6, 2011 at 17:26
  • Thanks @joeqwerty, I was trying to find the right term... I'll change it. Jun 6, 2011 at 17:26
  • Glad to pitch in.
    – joeqwerty
    Jun 6, 2011 at 17:28
  • Thanks gentlemen. Do you know of any official documentation of this behavior? Jun 7, 2011 at 12:21
  • 1
    added link for referrence Jun 7, 2011 at 14:33

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.

  • So another system could also use this header to prevent an auto reply loop correct? Jun 7, 2011 at 12:14
  • not that I am aware of
    – Jim B
    Jun 7, 2011 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. Feb 21, 2013 at 19:44

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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